am79c989 Advanced Micro Devices, am79c989 Datasheet - Page 32

• Manufacturer Part Number: am79c989
• Description: Quad Ethernet Switching Transceiver
• Manufacturer: Advanced Micro Devices

QuASI Interface
32
No.
9B
1
2
3
4
5
6
7
8
9
Symbol
t
QRX_VALID
t
t
t
t
t
t
t
t
t
MSI9B
QRST/STRB
QRX_DATA
QTX_DATA
MSI1
MSI2
MSI3
MSI4
MSI5
MSI6
MSI7
MSI8
MSI9
QRX_CRS
QTX_EN
QCLSN
SCLK
SCLK Period (40 MHz, 100 ppm).
Not Tested.
QRST/STRB hold time after rising edgeof SLCK.
QRST/STRB setup time to rising edge of SCLK.
SCLK high time.
SCLK low time.
QTX_EN and QTX_DATA setup time to rising edge of SCLK.
QTX_EN and QTX_DATA hold time from rising edge of SCLK.
QRX_DATA, QRX_VALID, QCLSN, QRX_CRS delay until valid
from rising edge of SCLK.
Reset Pulse Width of QRST/STRB.
Parameter tested functionally.
Strobe Pulse Width of QRST/STRB.
Not Defined
Figure 2. QuASI Interface Timing Diagram
Not defined
9
2
1
Channel 0
3
6
P R E L I M I N A R Y
Parameter Description
7
4
Am79C989
Channel 1
Channel 3
5
8
Channel 2
Channel 0
Channel 1
Channel 3
9B
2
Channel 0
Channel 2
3
24.9975
Min
10
10
4
1
9
3
5
3
5
Channel 1
Channel 3
25.0025
17.5
Max
25
21173B-6
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
s