參數(shù)資料
型號： MSC8156SVT1000B
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 數(shù)字信號處理
英文描述： 0-BIT, OTHER DSP, PBGA783
封裝： 29 X 29 MM, LEAD FREE, PLASTIC, FCBGA-783
文件頁數(shù)： 42/68頁
文件大小： 910K
代理商： MSC8156SVT1000B
Electrical Characteristics
MSC8156 Six-Core Digital Signal Processor Data Sheet, Rev. 3
Freescale Semiconductor
47
2.6.5
Ethernet Timing
This section describes the AC electrical characteristics for the Ethernet interface.
There are programmable delay units (PDU) that should be programmed differently for each interface to meet timing. There is
a general configuration register 4 (GCR4) used to configure the timing. For additional information, see the MSC8156 Reference
Manual.
2.6.5.1
Management Interface Timing
Table 33 lists the timer input Ethernet controller management interface timing specifications shown in Table 24.
Table 33. Ethernet Controller Management Interface Timing
Characteristics
Symbol
Min
Max
Unit
GE_MDC frequency
fMDC
—2.5
MHz
GE_MDC period
tMDC
400
—
ns
GE_MDC clock puylse width high
tMDC_H
160
—
ns
GE_MDC clock puylse width low
tMDC_L
160
—
ns
GE_MDC to GE_MDIO delay2
tMDKHDX
10
70
ns
GE_MDIO to GE_MDC rising edge setup time
tMDDVKH
20
—
ns
GE_MDC rising edge to GE_MDIO hold time
tMDDXKH
0—
ns
Notes:
1.
Program the GE_MDC frequency (fMDC) to a maximum value of 2.5 MHz (400 ns period for tMDC). The value depends on the
source clock and configuration of MIIMCFG[MCS] and UPSMR[MDCP]. For example, for a source clock of 400 MHz to
achieve fMDC = 2.5 MHz, program MIIMCFG[MCS] = 0x4 and UPSMR[MDCP] = 0. See the MSC8156 Reference Manual for
configuration details.
2.
The value depends on the source clock. For example, for a source clock of 267 MHz, the delay is 70 ns. For a source clock of
333 MHz, the delay is 58 ns.
Figure 24. MII Management Interface Timing
GE_MDC
GE_MDIO
(Input)
(Output)
tMDC
tMDDXKH
tMDDVKH
tMDKHDX
tMDC_H
tMDC_L
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