參數(shù)資料
型號： MC68MH360VR25L
廠商： Freescale Semiconductor
文件頁數(shù)： 136/158頁
文件大?。?/td> 0K
描述： IC MPU QUICC 25MHZ 357-PBGA
標準包裝： 44
系列： M683xx
處理器類型： M683xx 32-位
速度： 25MHz
電壓： 5V
安裝類型： 表面貼裝
封裝/外殼： 357-BBGA
供應商設(shè)備封裝： 357-PBGA（25x25）
包裝： 托盤
Chapter 5. Buffer Descriptors
NOTE
The gaps shown between RAM pages are not implemented on
the MC68360MH and cannot be addressed.
Table 5-3 shows functions available for various protocols on each SCC for the MC68360.
Figure 5-7 to Figure 5-10 show that not all the functions available to each SCC can be used
simultaneously due to overlaps of the register locations stored in the parameter RAM. For
example, in Figure 5-8, the SPI area overlaps the Ethernet area, which means the user can
use either SPI or Ethernet on SCC2, but not both at once.
5.3.2 Parameter RAM Usage for QMC over Several SCCs
There are two possible memory congurations for operating the QMC protocol on several
SCCs. For each SCC in QMC protocol, a global parameter area is used, consuming at most
170 bytes if every global area contains the routing tables. The time slot assignment tables
(TSATRx and TSATTx) together occupy 128 bytes. The tables for each SCC in the
parameter RAM can be duplicated, requiring 170 bytes per SCC.
Alternatively, multiple SCCs can use one set of common time slot assignment tables
(TSATRx and TSATTx), as described in Section 2.1.3, “TSATRx/TSATTx Pointers and
Time Slot Assignment Table.” One SCC RAM page uses 172 bytes, 44 bytes for registers
and 128 bytes for the common time slot assignment tables, allowing the other SCCs to use
only 44 bytes of parameter RAM for QMC protocol, freeing 128 bytes. This alternative is
referred to as ‘QMC on Multiple SCCs’ in Figure 5-7 to Figure 5-15.
Table 5-3. MC68360 Functions Available
Function
Available?
Transparent
HDLC
UART
Ethernet
QMC
Shared
QMC
SCC1
Yes
Misc
No
SCC2
Yes
SPI, Timer
Timer
No
SPI
SCC3
Yes
IDMA1, SMC1 IDMA1, SMC1 IDMA1, SMC1
IDMA1
No
IDMA1, SMC1
SMC1
SCC4
Yes
IDMA2, SMC2 IDMA2, SMC2 IDMA2, SMC2
IDMA2
No
IDMA2, SMC2
SMC2
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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