cx28500 Mindspeed Technologies, cx28500 Datasheet - Page 193

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

Table A-7.
28500-DSH-002-C
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)
In Spare Time Amnt Filled
In Spare Time Amnt Emptied
Max Total in SLP Buffer
Max Total in SLP Buffer
MAXDATA
MAXDATA
Max L
Max L
Max L
ch
pci
ch
pci
ch
pci
ch
(ms)
(ms)
(ms)
(ms)
(ms)
(ms)
(ms)
Example Two (2 of 3)
pci
Configuration
66 MHz PCI
pci
THR – RX
Mindspeed Proprietary and Confidential
BUFFLEN
THR – TX
Fch – RX
Mindspeed Technologies
Fch – TX
Average
TOTAL
TOTAL
Actual
fpci
RX
RX
RX
RX
RX
RX
RX
TX
TX
TX
TX
RX
TX
RX
TX
RX
TX
TX
TX
—
Not Including Spare Time
64-Bit PCI
Including Spare Time
168 x 1536K Channels
1568.68
1437.96
66000
27458
0.508
0.092
0.554
0.091
0.416
0.462
0.416
0.508
0.092
0.554
1592
1592
1526
796
796
352
352
144
132
653
598
352
352
6
6
3
Calculated
CX28500 PCI Bus Latency and Utilization Analysis
32-Bit PCI
1568.68
1437.96
44-Byte Messages
66000
25279
0.125
0.125
0.508
0.554
0.124
0.383
0.429
0.383
0.508
0.554
1592
1592
1526
796
796
352
352
195
179
601
551
352
352
7
7
3
®
64-Bit PCI
6 x 44.21M Channels
45150.64
41388.09
43723
21861
21861
66000
31747
21719
19909
43723
41899
0.484
0.003
0.528
0.003
0.481
0.525
0.481
0.484
0.003
0.528
352
352
143
129
352
352
6
6
3
32-Bit PCI
45150.64
41388.09
43723
21861
21861
66000
31675
21669
19863
43723
41899
0.484
0.004
0.528
0.004
0.480
0.524
0.480
0.484
0.004
0.528
352
352
192
174
352
352
7
7
3
64-Bit PCI
12311370
186.607
248.810
186.536
248.738
186.536
186.607
248.810
168 x 4K Channels
66000
12-Byte Messages
0.071
0.071
0.071
1592
1592
1393
4.27
3.20
796
796
796
597
96
96
96
96
6
6
3
0
0
32-Bit PCI
12310532
186.607
248.810
186.523
248.726
186.523
186.607
248.810
66000
0.084
0.084
0.084
1592
1592
1393
4.27
3.20
796
796
796
597
96
96
96
96
7
7
3
0
0
178