AM79C971VCW Advanced Micro Devices, AM79C971VCW Datasheet - Page 226

• Manufacturer Part Number: AM79C971VCW
• Description: PCnet-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
• Manufacturer: Advanced Micro Devices

SWITCHING WAVEFORMS: GENERAL-PURPOSE SERIAL INTERFACE
226
(RXDAT)
(RXCLK)
Receive
Collision
Collision
Receive
(CLSN),
(CLSN),
(TXDAT)
Transmit
(TXCLK)
Transmit
Present
(RXEN)
Inactive
Transmit
Collision
(Note 1)
(Note 2)
Carrier
Present
(RXEN)
(TXEN)
(CLSN)
Active
Notes:
1. If RXCRS is not present during transmission, LCAR bit in TMD2 will be set.
2. If CLSN is not present during or shortly after transmission, CERR in CSR0 will be set.
Clock
Enable
Carrier
Data
Clock
Data
t GPR4
t GPR4
(First Bit Preamble)
(First Bit Preamble)
t GPT3
t GPR11
t GPT1
t GPT2
t GPT3
t GPR5
t GPR1
t GPT5
t GPR2
t GPR7
Figure 89. Transmit Timing
Figure 90. Receive Timing
Am79C971
(No Collision)
t GPR3
t GPT4
(Address Type Designation Bit) (Last Bit)
t GPT7
t GPT6
(Last Bit)
t GPR8 t GPR9
t GPT3
t GPR5
t GPT5
t GPR10
t GPT8
t GPR12
t GPR5
20550D-93
20550D-92