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型号： MC68MH360ZQ25VL
厂商： Freescale Semiconductor
文件页数： 143/158页
文件大小： 0K
描述： IC MPU QUICC 25MHZ 357-PBGA
标准包装： 44
系列： M683xx
处理器类型： M683xx 32-位
速度： 25MHz
电压： 3.3V
安装类型： 表面贴装
封装/外壳： 357-BBGA
供应商设备封装： 357-PBGA（25x25）
包装： 托盘
Chapter 5. Buffer Descriptors
If the QMC operates with a full 64 channels, no space is left in the lower 4-Kbyte area. In
this case, the only free areas are in the RAM pages, each 256-bytes large. Depending on the
functions, channels and protocols used, some areas remain free for buffer descriptors. Also,
if a particular function is not enabled, its parameter RAM area may also be used.
If fewer than 64 logical channels are used or if physical channels are concatenated to super
channels, space is freed in the dual-ported RAM. Each unused logical channel creates a 64-
byte hole in the dual-ported RAM. This area is free for buffer descriptors for any SCC.
QMC channels can also use this space instead of external memory for buffer descriptors,
reducing the load on the external bus.
Figure 5-11 shows the internal memory map for the MPC860MH. Figure 5-12 to
Figure 5-15 show a more detailed memory map for each SCC, showing the parameter RAM
usage for different functions.
RAM page one is dedicated to SCC1, I2C, IDMA1 and for miscellaneous storage.
RAM page two is dedicated for SCC2, SPI, IDMA2 and RISC timers
RAM page three is dedicated for SCC3, SMC1 and DSP1 operations.
RAM page four is dedicated for SCC4, SMC2 and DSP2 operations.
Table 5-4 shows the functions available for various protocols on each SCC for the
MPC860MH.
Figure 5-12 to Figure 5-15 show that not all the functions available on each SCC can be
used simultaneously due to overlaps of the register locations stored in the parameter RAM.
Table 5-4. MPC860MH Functions Available
Function
Available?
Transparent
HDLC
UART
Ethernet
QMC
Shared QMC
SCC1
Yes
Misc, I2C,
IDMA1
Misc, I2C,
IDMA1
Misc, I2C,
IDMA1
Misc, IDMA1
No
I2CI2CI2C
SCC2
Yes
SPI, Timer,
IDMA2
SPI, Timer,
IDMA2
SPI, Timer,
IDMA2
Timer, IDMA2 Timer, IDMA2 Timer, IDMA2
No
SPI
SCC3
Yes
SMC1, DSP1
DSP1
No
SMC1
SCC4
Yes
SMC2, DSP2
DSP2
No
SMC2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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