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RELEASED
DATA SHEET
PM7366 FREEDM-8
ISSUE 4
PMC-1970930
FRAME ENGINE AND DATA LINK MANAGER
9.8.3
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
71
Channel Assigner
The channel assigner block determines the channel number of the request currently being
processed. The block contains a 256 word channel provision RAM. The address of the RAM is
constructed from concatenating the link number and the time-slot number of the highest priority
requester. The fields of each RAM word include the channel number and a time-slot enable flag.
The time-slot enable flag labels the current time-slot as belonging to the channel indicted by the
channel number field. For time-slots that are enabled, the channel assigner issues a request to
the THDL block which responds with packet data within one byte period of the transmit stream.
9.9
Performance Monitor
The Performance Monitor block (PMON) contains four counters. The first two accumulate receive
partial packet buffer FIFO overrun events and transmit partial packet buffer FIFO underflow
events, respectively. The remaining two counters are software programmable to accumulate a
variety of events, such as receive packet count, FCS error counts, etc. All counters saturate upon
reaching maximum value. The accumulation logic consists of a counter and holding register pair.
The counter is incremented when the associated event is detected. Writing to the FREEDM-8
Master Clock / BERT Activity Monitor and Accumulation Trigger register transfer the count to the
corresponding holding register and clear the counter. The contents of the holding register is
accessible via the PCI interface.
9.10 JTAG Test Access Port Interface
The JTAG Test Access Port block provides JTAG support for boundary scan. The standard JTAG
EXTEST, SAMPLE, BYPASS, IDCODE and STCTEST instructions are supported. The FREEDM-
8 identification code is 173660CD hexadecimal.
9.11 PCI Host Interface
The FREEDM-8 supports two different normal mode register types as defined below:
1. PCI Host Accessible registers (PA) - these registers can be accessed through the PCI Host
interface.
2. PCI Configuration registers (PC) - these register can only be accessed through the PCI Host
interface during a PCI configuration cycle.
The PCI registers are addressable on dword boundaries only. The PCI offset shown in the table
below must be combined with a base address to form the PCI Interface address. The base
address can be found in the FREEDM-8 Memory Base Address register in the PCI Configuration
memory space.