AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 38
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: 38 of 309
- Download datasheet (3Mb)
The Am79C976 controller does not support burst ac-
cess to the configuration space, the first 32 bytes of its
I/O or memory space, or to the Expansion Bus. The
host indicates a burst transaction by keeping FRAME
asserted during the data phase. When the Am79C976
controller sees FRAME and IRDY asserted in the clock
cycle before it wants to assert TRDY, it also asserts
STOP at the same time. The transfer of the first data
phase is still successful, since IRDY and TRDY are
both asserted. See Figure 66.
38
DEVSEL
FRAME
TRDY
STOP
C/BE
IRDY
CLK
PAR
AD
1
ADDR
CMD
2
PAR
3
DATA
BE
4
PAR
P R E L I M I N A R Y
5
22929B7
Am79C976
If the host is not yet ready when the Am79C976 control-
ler asserts TRDY, the device will wait for the host to as-
sert IRDY. When the host asserts IRDY and FRAME is
still asserted, the Am79C976 controller will finish the
first data phase by deasserting TRDY one clock later.
At the same time, it will assert STOP to signal a discon-
nect to the host. STOP will stay asserted until the host
removes FRAME. See Figure 77.
DEVSEL
FRAME
TRDY
STOP
IRDY
C/BE
CLK
PAR
AD
1
1st DATA
2
BE
PAR
3
DATA
BE
4
PAR
5
8/01/00
22929B8
Related parts for AM79C976
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Advanced Micro Devices [8 Megabit (512 K x 16-Bit) CMOS 3.0 Volt-only Burst Mode Flash Memory]
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
M41000001YAdvanced Micro Devices [32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (512 K x 8-Bit/256 K x 16-Bit) Static RAM]
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Advanced Burst Error Processor
Manufacturer:
Advanced Micro Devices
Part Number:
Description:
Serial interface adapter (SIA)
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Universal interrupt controller
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
256 kilobit CMOS EPROM
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
2048 x 8 static RAM, 100ns
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
AM2966PCOctal Dynamic Memory Drivers with Three-State Outputs
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
Part Number:
Description:
TTL programmable array logic, 7ns
Manufacturer:
Advanced Micro Devices
Datasheet: