AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 281
AM79C976
Manufacturer Part Number
AM79C976
Description
PCnet-PRO 10/100 Mbps PCI Ethernet Controller
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C976.pdf
(309 pages)
- Current page: 281 of 309
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SWITCHING CHARACTERISTICS: EXTERNAL ADDRESS DETECTION
INTERFACE
Note:
1. May need to delay RX_CLK to capture Start Frame Byte Delimiter (SFBD) at 100 Mbps operation.
8/01/00
RXD[3:0]
External Address Detection Interface: External PHY - MII @ 25 MHz
t
t
t
t
External Address Detection Interface: External PHY - MII @ 2.5 MHz
t
t
t
Receive Frame Tag Timing with Media Independent Interface
t
t
t
t
RX_CLK
EAD7
EAD8
EAD9
EAD10
EAD11
EAD12
EAD13
EAD14
EAD15
EAD16
EAD17
RX_DV
SF/BD
Parameter
SFBD
Symbol
EAR
SFBD change from RX_CLK
EAR deassertion to RX_DV (first
rising edge)
EAR assertion after SFD event
(frame rejection)
EAR assertion width
EAR deassertion to RX_DV (first
rising edge)
EAR assertion after SFD event
(frame rejection)
EAR assertion width
RXFRTGE assertion from SFBD
(first rising edge)
RXFRTGE, RXFRTGD setup to
RX_CLK
RXFRTGE, RXFRTGD hold from
RX_CLK
RXFRTGE deassertion to RX_DV
t EAD8
Parameter Name
Preamble
P R E L I M I N A R Y
RX_CLK @25 MHz
RX_CLK @2.5 MHz
Am79C976
SFD
Test Condition
t EAD7
DA
t EAD9
DA
0
40
0
50
400
0
500
0
10
10
40
400
Min
t EAD10
20 (Note 1) ns
5,080
50,800
DA
Max
22929B65
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
281
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