AM79C961AVIW AMD (ADVANCED MICRO DEVICES), AM79C961AVIW Datasheet - Page 203

• Manufacturer Part Number: AM79C961AVIW
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C961AVIW

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / Rohs Status: Not Compliant

Am79C961A PCnet-ISA II
Silicon Errata Report
AM79C961A REV FD SILICON STATUS
The items below are the known errata for Rev FD silicon. Rev FD silicon is the production silicon.
Note: A signal followed by "*" indicates active low; i.e., MASTER*.
The Description section of this document gives an external description of the problem. The Implication section
gives an explanation of how the PCnet-ISA II controller behaves and its impact on the system. The Work-around
section describes a work around for the problem.
The Status section indicates when and how the problem will be fixed.
Current package marking for this revision: Line 1: <Logo>
Value of chip identification registers, CSR89+CSR88 [31:0] for this revision = 32261003h.
1) False BABL errors generated
Description: The PCnet-ISA II FD device will intermittenly give BABL error indications when the network traffic has
frames equal to or greater than 1518 bytes.
Implication: False BABL errors on the receiving station can be passed up to the upper layer software if PCnet-ISA
II FD device is just coming out of deferral and the multi-purpose counter used to count the number of bytes re-cevied
reaches 1518 at the same time. If the network is heavily loaded with full-size frames, then the probability of a false
BABL error is high.
Work-around: There are two possible work-arounds.
1. If the user has no intention to transmit frames larger than 1518 bytes, then the BABL bit may be masked to ignore
babble errors. In this case the false babble error will not cause an interrupt, nor will it be passed to the higher level
software.
2. Check to see if the device is transmitting in ISR (Interrupt Service Routine), which is induced by the BABL error.
The BCRs which control the LED settings can be programmed to indicate a transmit activity, assuming the interrupt
latency is not longer than one mininum IFG (inter-frame gap) time.
Status: No current plan to fix this item.
If (ISR_LATENCY < 9.6 us)
True_bable_err = BABL * ( TINT + XMT_LED)
{ i.e. False_bable_err = ~ (BABL * ( TINT + XMT_LED))}
else
Cannot tell if the BABL error is true or false just by reading BABL, TINT, XMT_LED
bits in ISR.
APPENDIX G
Line 2: PCnet(tm)-ISA II
Line 3: Am79C961AKC (Assuming package is PQFP)
Line 4: <Date Code> FD
Line 5: (c) 1993 AMD
Am79C961A
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