Table of Contents
Contents
Page
2
Agere Systems Inc.
T8302 Internet Protocol Telephone
Advanced RISC Machine (
ARM
)
Data Sheet
July 2001
1 Introduction ...........................................................................................................................................................1
1.1 PT_
ARM
Features ........................................................................................................................................15
1.2 IPT_DSP Features .......................................................................................................................................16
2 Pinout Information ...............................................................................................................................................17
2.1 272-Pin PBGA Pin Diagram .........................................................................................................................17
2.2 Pin List ..........................................................................................................................................................18
3 Overview .............................................................................................................................................................26
3.1
ARM
940T and
AMBA
Bridge .......................................................................................................................28
3.2 IPT_
ARM
Memory and I/O Map ...................................................................................................................28
4 Reset/Clock Management ..................................................................................................................................29
4.1 Reset/Clock Management Controller Theory of Operation ...........................................................................31
4.1.1 Reset Operation ..................................................................................................................................31
4.1.2 Operation of the Clock Switching Logic ..............................................................................................32
4.1.2.1 PLL Operation .........................................................................................................................32
4.1.3 Latency ................................................................................................................................................33
4.1.4 Real-Time Clock (RTC) .......................................................................................................................33
4.2 Reset/Clock Management Registers ............................................................................................................35
4.2.1 Pause Register ....................................................................................................................................35
4.2.2 Version ID Register .............................................................................................................................36
4.2.3 Clock Management Register ...............................................................................................................36
4.2.4 Clock Status Register ..........................................................................................................................37
4.2.5 System Clock Source Encoding ..........................................................................................................38
4.2.6 Clock Control Register ........................................................................................................................38
4.2.7 Soft Reset Register .............................................................................................................................38
4.2.8 PLL Control Register ...........................................................................................................................39
4.2.9 Reset Status (Control/Clear) Registers ...............................................................................................40
4.2.10 Reset Peripheral Control (Read, Clear, Set) Registers .....................................................................40
4.2.11 RTC External Divider Register ..........................................................................................................41
4.2.12 RTC Clock Prescale Registers ..........................................................................................................42
4.2.13 RTC Control Register ........................................................................................................................43
4.2.14 RTC Seconds Alarm Register ...........................................................................................................44
4.2.15 RTC Seconds Count Register ...........................................................................................................44
4.2.16 RTC Divider Register ........................................................................................................................44
4.2.17 RTC Interrupt Status Register ...........................................................................................................45
4.2.18 RTC Interrupt Enable Register ..........................................................................................................45
4.3 Operation on Reset ......................................................................................................................................46
5 Programmable Interrupt Controller (PIC) ............................................................................................................47
5.1 Interrupt Controller Operation .......................................................................................................................47
5.1.1 Interrupt Registers ...............................................................................................................................48
5.2 Programmable Interrupt Controller Registers ...............................................................................................50
5.2.1 Interrupt Request Status Register IRSR .............................................................................................51
5.2.2 Interrupt Request Enable Registers IRER (Set, Clear) .......................................................................51
5.2.3 Interrupt Request Soft Register IRQSR ..............................................................................................52
5.2.4 Interrupt Priority Control Registers IPCR[15:1] ...................................................................................52
5.2.5 Interrupt In-Service Registers ISR (ISRI, ISRF) ..................................................................................53
5.2.6 Interrupt Request Source Clear Register IRQESCR ...........................................................................53
5.2.7 Interrupt Priority Enable Registers IPER (Set, Clear) .........................................................................54
5.2.8 External Interrupt Control Registers ....................................................................................................55
6 Programmable Direct Memory Access (DMA) Controller ...................................................................................56
6.1 DMA Operation .............................................................................................................................................56