AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 225

• Manufacturer Part Number: AM79C978
• Description: Single-Chip 1/10 Mbps PCI Home Networking Controller
• Manufacturer: Advanced Micro Devices

SWITCHING CHARACTERISTICS: BUS INTERFACE (CONTINUED)
External Clock (XTAL) Timing Specifications
External Clock (Oscillator) Timing Specification
PMD Interface
PECL
Note:
1. Not included in the production test.
No.
No.
160
161
162
163
164
No.
1
2
3
1
2
3
t
t
t
SK
R
F
Symbol
Symbol
Symbol
(Note 1)
(Note 1)
(Note 1) TX+ to TX- skew
t
t
t
t
t
t
PWH
PWH
t
PWL
PWL
t
PER
PER
S
H
TX+, TX- Rise Time
TX+, TX- Fall Time
SDI setup time to XCLK high
SDI hold time to XCLK high
Cycle time
Cycle high time
Clock low time
Cycle time
Cycle high time
Clock low time
XCLK
Parameter Description
Figure 53. PMD Interface Timing (PECL)
Parameter Description
Parameter Description
TX+,TX–
TX+
TX–
1
Figure 52. Clock Timing
Clock Timing
Clock Timing
Am79C978
160
162
20%
80%
2
Test Conditions
PECL Load
PECL Load
PECL Load
161
--
--
3
0.4* Tcycle
0.4* Tcycle
0.4*Tcycle
0.4*Tcycle
49.995
16.665
Min
Min
Min
0.5
0.5
--
7
5
0.6*Tcycle
0.6*Tcycle
0.6*Tcycle
0.6*Tcycle
50.005
16.669
+200
Max
Max
Max
--
--
3
3
22206B-56
22206B-55
Unit
Unit
Unit
ns
ns
ps
ns
ns
ns
ns
ns
ns
ns
ns
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