参数资料
型号: MC8640DHX1250HE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1250 MHz, MICROPROCESSOR, CBGA1023
封装: 33 X 33 MM, CERAMIC, FCBGA-1023
文件页数: 61/130页
文件大小: 1495K
代理商: MC8640DHX1250HE
MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 3
36
Freescale Semiconductor
Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management
Figure 17 shows the TBI receive AC timing diagram.
Figure 17. TBI Receive AC Timing Diagram
8.2.5
TBI Single-Clock Mode AC Specifications
When the eTSEC is configured for TBI modes, all clocks are supplied from external sources to the relevant
eTSEC interface. In single-clock TBI mode, when TBICON[CLKSEL] = 1 a 125-MHz TBI receive clock
is supplied on TSECn_RX_CLK pin (no receive clock is used on TSECn_TX_CLK in this mode, whereas
for the dual-clock mode this is the PMA1 receive clock). The 125-MHz transmit clock is applied on the
TSEC_GTX_CLK125 pin in all TBI modes.
A summary of the single-clock TBI mode AC specifications for receive appears in Table 34.
Table 34. TBI single-clock Mode Receive AC Timing Specification
At recommended operating conditions with L/TVDD of 3.3 V ± 5% and 2.5 V ± 5%.
Parameter
Symbol
Min
Typ
Max
Unit
RX_CLK clock period
tTRR
1
1 ±100 ppm tolerance on RX_CLK frequency
7.5
8.0
8.5
ns
RX_CLK duty cycle
tTRRH/tTRR
40
50
60
%
RX_CLK peak-to-peak jitter
tTRRJ
250
ps
Rise time RX_CLK (20%–80%)
tTRRR
——
1.0
ns
Fall time RX_CLK (80%–20%)
tTRRF
——
1.0
ns
RCG[9:0] setup time to RX_CLK rising edge
tTRRDVKH
2.0
ns
RCG[9:0] hold time to RX_CLK rising edge
tTRRDXKH
1.0
ns
PMA_RX_CLK1
RCG[9:0]
tTRX
tTRXH
tTRXR
tTRXF
tTRDVKH
PMA_RX_CLK0
tTRDXKH
tTRDVKH
tTRDXKH
tSKTRX
tTRXH
Valid Data
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