AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 281

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

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