AM79C978A AMD [Advanced Micro Devices], AM79C978A Datasheet - Page 222

• Manufacturer Part Number: AM79C978A
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: AMD [Advanced Micro Devices]

SWITCHING CHARACTERISTICS: BUS INTERFACE (Continued))
External Clock
PMD Interface
PECL
Note:
1. Not included in the production test.
222
No.
160
161
162
163
164
No.
1
2
3
t
t
t
SK
R
F
Symbol
Symbol
(Note 1)
(Note 1)
(Note 1) TX+ to TX- skew
t
t
t
PWH
PWL
t
t
PER
S
H
TX+, TX- Rise Time
TX+, TX- Fall Time
SDI setup time to XCLK high
SDI hold time to XCLK high
XCLK Period
XCLK High Pulse Width
XCLK Low Pulse Width
XCLK
Parameter Description
TX+,TX–
Figure 53. PMD Interface Timing (PECL)
TX+
TX–
Parameter Description
1
Figure 52. Clock Timing
160
162
Am79C978A
Clock Timing
20%
80%
2
Test Conditions
PECL Load
PECL Load
PECL Load
161
–
–
3
39.996
Min
18
18
Min
0.5
0.5
–
–
5
40.004
+200
Max
Max
22
22
3
3
–
–
22399A-55
22399A-56
Unit
Unit
ns
ns
ps
ns
ns
ns
ns
ns