cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 195

• Manufacturer Part Number: cx28500
• Description: Cx28500 Multichannel Synchronous Communications Controller
• Manufacturer: Mindspeed Technologies

Table A-8.
28500-DSH-002-C
Number of Ch
Total Mem Available (KB)
Mem Available (KB)
Packet Length (bits)
Ext. Ch Rate (Kbps)
PCI Freq. (MHz)
Read Latency
Write Latency
PCI Bit Mode
Buffer Size
Rx Threshold
Tx Threshold
Int. Ch Rate (Kbps)
Int. Ch Rate (Kbps)
PCI Freq. (kHz)
Time to Read BD
Time to Read BD
Time to Update Status
MAXDATA
MAXDATA
Max L
Max L
Max L
Max L
Amnt Data Filled in L
Amnt Data Emptied in L
Spare Time (ms)
Spare Time (ms)
Spare Time (ms)
Spare Time (cycles)
ch
pci
ch
pci
(ms)
(ms)
(ms)
(ms)
Example Three (1 of 2)
pci
Configuration
66 MHz PCI
pci
THR – RX
THR – TX
Mindspeed Proprietary and Confidential
BUFFLEN
Fch – RX
Mindspeed Technologies
Fch – TX
Average
TOTAL
TOTAL
Actual
PBIT
fpci
fpci
RX
RX
RX
RX
TX
TX
TX
TX
RX
TX
—
—
M
N
R
R
w
r
64-Bit PCI
Including Spare Time
168 x 1536K Channels
66000
25181
63.83
0.506
0.125
0.552
0.125
0.382
0.428
0.382
1536
1588
1569
1438
168
352
794
794
352
352
195
179
64
66
64
0
0
4
4
3
Suggested
Calculated
CX28500 PCI Bus Latency and Utilization Analysis
32-Bit PCI
44-Byte Messages
66000
25181
0.125
4.219
0.625
0.125
4.094
5.500
0.382
0.17
168
64
96
66
64
36
18
18
4
0
0
4
3
4
4
3
0
0
1
0
®
64-Bit PCI
6 x 44.21M Channels
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
32-Bit PCI
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
64-Bit PCI
168 x 4K Channels
12-Byte Messages
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
32-Bit PCI
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
180