AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 167
![no-image](/images/manufacturer_photos/0/0/14/advanced_micro_devices_sml.jpg)
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: 167 of 309
- Download datasheet (3Mb)
Offset 17Ah
Offset 178h
8/01/00
SRAM Boundary Register
15-0
15-0
Bit
Bit
SRAM_SIZE
SRAM_BND
Name
Name
SRAM Boundary. Specifies the size of the transmit buffer portion of the SRAM in units of 512-byte
pages. For example, if SRAM_BND is set to 10, then 5120 bytes of the SRAM will be allocated for
the transmit buffer and the rest will be allocated for the receive buffer.
The transmit buffer in the SRAM begins at address 0 and ends at the address (SRAM_BND*512)-
1. Therefore, the receive buffer always begins on a 512-byte boundary.
SRAM_BND must be initialized to an appropriate value, either by the EEPROM or by the host CPU.
SRAM_BND must be set to a value less than or equal to IFFCh. Values larger than IFFCh will
cause incorrect behavior.
Note: The minimum allowed number of pages for normal network operation is four, and the
maximum is SRAM_SIZE - 4.
This register is an alias of BCR26.
SRAM Size. Specifies the total size of the SSRAM buffer in units of 512-byte pages. For example,
assume that the external memory consists of one 64K X 32 bit SSRAM, for a total of 256K bytes.
In this case SRAM_SIZE should be set to 512 (256K divided by 512).
This field must be initialized to the appropriate value, either by the EEPROM or by the host CPU.
SRAM_SIZE must be set to a value less than or equal to 2000h. Values larger than 2000h will
cause incorrect behavior.
Note: The minimum allowed number of pages is eight for normal network operation.
This register is an alias of BCR25.
Table 76.
Table 77.
P R E L I M I N A R Y
SRAM Boundary Register
Am79C976
SRAM Size Register
All bits in this register are cleared to 0 when the RST
pin is asserted, before the serial EEPROM is read, and
after a serial EEPROM read error.
All bits in this register are cleared to 0 when the RST
pin is asserted, before the serial EEPROM is read, and
after a serial EEPROM read error.
Description
Description
167
Related parts for AM79C976
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![AM27S29DC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM27S29APC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Micro Devices [4,096-Bit (512x8) Bipolar PROM]
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM29BL802CB-70RZE](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
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:
![M41000001Y](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
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:
![AM95C94JC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Advanced Burst Error Processor
Manufacturer:
Advanced Micro Devices
![AM7992BPC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Serial interface adapter (SIA)
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM9519ADC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Universal interrupt controller
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM27C256-150DC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
256 kilobit CMOS EPROM
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM9128-10PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
2048 x 8 static RAM, 100ns
Manufacturer:
Advanced Micro Devices
Datasheet:
![P8284A](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS98N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![AM2966PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
AM2966PCOctal Dynamic Memory Drivers with Three-State Outputs
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS97N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![DM81LS96N](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
Three-State Octal Buffers
Manufacturer:
Advanced Micro Devices
Datasheet:
![PAL16L8-7PC](/images/manufacturer_photos/0/0/14/advanced_micro_devices_tmb.jpg)
Part Number:
Description:
TTL programmable array logic, 7ns
Manufacturer:
Advanced Micro Devices
Datasheet: