參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 97/153頁
文件大?。?/td> 838K
代理商: AM79C974
P R E L I M I N A R Y
AMD
97
Am79C974
AC SWITCHING CHARACTERISTICS
Attachment Unit Interface
Parameter
Symbol
Parameter Description
AUI Port
t
DOTR
DO+, DO– Rise Time (10% to 90%)
t
DOTF
DO+, DO– Fall Time (10% to 90%)
t
DORM
DO+, DO– Rise and Fall Time Mismatch
t
DOETD
DO
±
End of Transmission
t
PWODI
DI Pulse Width Accept/Reject Threshold
t
PWKDI
DI Pulse Width Maintain/Turn-Off
Threshold
t
PWOCI
CI Pulse Width Accepth/Reject Threshold
t
PWKCI
CI Pulse Width Maintain/Turn-Off
Threshold
Internal MENDEC Clock Timing
tx1
XTAL1 Period
tx1H
XTAL1 HIGH Pulse Width
tx1L
XTAL1 LOW Pulse Width
tx1R
XTAL1 Rise Time
tx1F
XTAL1 Fall Time
Test Conditions
Min
Max
Unit
2.5
2.5
5.0
5.0
1.0
375
45
200
ns
ns
ns
ns
ns
ns
200
15
136
|V
IN
| > |VASQ| (Note 1)
|V
IN
| > |VASQ| (Note 2)
|V
IN
| > |VASQ| (Note 3)
|V
IN
| > |VASQ| (Note 4)
10
90
26
160
ns
ns
V
IN
= External Clock
V
IN
= External Clock
V
IN
= External Clock
V
IN
= External Clock
V
IN
= External Clock
49.995
20
20
50.001
ns
ns
ns
ns
ns
5
5
Notes:
1. DI pulses narrower than t
PWODI
(min) will be rejected; pulses wider than t
PWODI
(max) will turn internal DI carrier sense on.
2. DI pulses narrower than t
PWKDI
(min) will maintain internal DI carrier sense on; pulses wider than t
PWKDI
(max) will turn internal
DI carrier sense off.
3. CI pulses narrower than t
PWOCI
(min) will be rejected; pulses wider than t
PWOCI
(max) will turn internal CI carrier sense on.
4. CI pulses narrower than t
PWKCI
(min) will maintain internal CI carrier sense on; pulses wider than t
PWKCI
(max) will turn internal
CI carrier sense off.
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相關代理商/技術參數(shù)
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