83C795 Datasheet, PDF (109/136 Pages) List of Unclassifed Manufacturers – Ethernet System Controller

83C795
AC OPERATING CHARACTERISTICS AND TIMING
PARAMETER
T 88
T 89
T 90
T 91
T 92
T 93
T 94
DESCRIPTION
X1 clock period
X1 clock width high
X1 clock ris e time
X1 clock fall time
X1 clock width low
Link tes t puls e width
I/O write recovery time
MIN
45
22.5
–
–
22.5
–
2
TYP
50
25
–
–
25
100
–
MAX
–
–
3
3
–
–
–
UNITS
ns ec
cycles
TABLE 10-2. TIMING PARAMETERS (cont.)
NOTES
1. All numbers are in nanoseconds except where otherwise designated.
2. All outputs are measured under 50pF load.
3. The external Manchester Encoder/Decoder port is multiplexed out on other pins in certain test
modes only. Use the table below to determine which Manchester signals correspond to which
pin names.
MANCHESTER SIGNALS
XTXD
XLOOP
XCRS
XRXC
XRXD
XCOL
XTXC
XTXE
83C795 I/O PINS
IRQ1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
ROMCS
TABLE 10-3. TEST PIN I/O MATCHING
Refer to Chapter 4 for more details.
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