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型号： MC68MH360CAI25L
厂商： Freescale Semiconductor
文件页数： 16/158页
文件大小： 0K
描述： IC MPU QUICC 25MHZ 240-FQFP
标准包装： 24
系列： M683xx
处理器类型： M683xx 32-位
速度： 25MHz
电压： 5V
安装类型： 表面贴装
封装/外壳： 240-BFQFP
供应商设备封装： 240-FQFP（32x32）
包装： 托盘
QMC Supplement
8.2 CPM Loading
This section primarily deals with the CPM loading of the MH360 and 860MH. As the CPM
architecture is identical on both devices, the performance for a given clock frequency is
identical. Compared to standard protocols, the QMC protocol places more demands on the
CPM RISC because it requires the CPM to handle all of the bit manipulation normally
implemented with hardware support built into the SCCs.
The SCC operates transparently in QMC mode. The SCC’s main function is serial-to-
parallel conversion of the data stream out of the time slot assigner, and parallel-to-serial
conversion of the data stream gated into the time slot assigner. All bit manipulating is done
in the CPM RISC software or hardware. Thus, the CPM has a much higher load when
operating in QMC mode, even if all time slots are concatenated to one logical channel. This
loading is reected in the measured performance.
Table 8-2 gives loading guidelines. The table assumes a single SCC running at 100% of the
CPM bandwidth. For each protocol supported, the table gives the ratio of the SCC bit rate
versus clock frequency, and the maximum serial throughput at standard frequencies.
SCC1: 10-Mbps Ethernet; SCC2: 16 x 64-Kbps QMC;
SCC3: 16 x 64-Kbps QMC; SCC4: 64-Kbps HDLC.
TDM bit rate = 2.048 Mbps
No
Yes
SCC1: 10-Mbps Ethernet; SCC2: 12 x 64-Kbps QMC;
SCC3: 12 x 64-Kbps QMC; SCC4: 64-Kbps HDLC.
TDM bit rate = 1.544 Mbps
No
Yes
SCC1: 24-channel QMC; SCC2: 24-channel QMC.
Serial bit rate 2 x 1.544 Mbps — 2 x T1
No
Yes
SCC1: 10-Mbps Ethernet SCC2: 24-channel QMC;
SCC3: 24 Channel QMC.
Serial bit rate 2 x 1.544 Mbps — 2 x T1
No
Yes
SCC1: 32-channel QMC; SCC2: 32-channel QMC.
Serial bit rate 2 x 2.048 Mbps (E1/CEPT)
No
Yes
Table 8-2. CPM Performance Table
Protocol
SCC Rate: Clock Frequency
Mbps: MHz
Maximum Serial Throughput
25 MHz
Mbps
33 MHz
Mbps
40 MHz
Mbps
50 MHz
Mbps
Transparent
1 : 3.125 FD
8
10.56
12.8
16
HDLC
1 : 3.125 FD
8
10.56
12.8
16
UART
1 : 10.4 FD
2.4
3.168
3.84
4.8
Table 8-1. Common QMC Configurations (Continued)
Protocols Selected
Frequency Supported
25 MHz
33 MHz
40 MHz
50 MHz
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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