參數(shù)資料
型號： MC68CK338CPV14B1
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 14.4 MHz, MICROCONTROLLER, PQFP144
封裝： PLASTIC, TQFP-144
文件頁數(shù)： 64/133頁
文件大?。?/td> 944K
代理商： MC68CK338CPV14B1
MOTOROLA
MC68CK338
36
MC68CK338TS/D
CSORBT, the option register for CSBOOT, contains special reset values that support bootstrap opera-
tion from peripheral memory devices.
The following bit descriptions apply to both CSORBT and CSOR[0:10] option registers.
MODE — Asynchronous/Synchronous Mode
0 = Asynchronous mode (chip-select assertion determined by bus control signals)
1 = Synchronous mode (chip-select assertion synchronized with ECLK signal)
In asynchronous mode, the chip-select is asserted synchronized with AS or DS.
DSACK[3:0] is not used in synchronous mode because a bus cycle is only performed as a synchronous
operation. When a match condition occurs on a chip-select programmed for synchronous operation, the
chip-select signals the EBI that an ECLK cycle is pending.
BYTE[1:0] — Upper/Lower Byte Option
This field is used only when the chip-select 16-bit port option is selected in the pin assignment register.
Table 24 lists upper/lower byte options.
R/W[1:0] — Read/Write
This field causes a chip-select to be asserted only for reads, only for writes, or for both reads and writes.
Refer to Table 25 for options available.
STRB — Address Strobe/Data Strobe
0 = Address strobe
1 = Data strobe
This bit controls the timing for assertion of a chip-select in asynchronous mode. Selecting address
strobe causes chip-select to be asserted synchronized with address strobe. Selecting data strobe caus-
es chip-select to be asserted synchronized with data strobe.
DSACK[3:0] — Data and Size Acknowledge
This field specifies the source of DSACK[3:0] in asynchronous mode. It also allows the user to adjust
bus timing with internal DSACK[3:0] generation by controlling the number of wait states that are inserted
to optimize bus speed in a particular application. Table 26 shows the DSACK[3:0] encoding. The fast
termination encoding (%1110) is used for two-cycle access to external memory.
Table 24 Upper/Lower Byte Options
BYTE[1:0]
Description
00
Disable
01
Lower Byte
10
Upper Byte
11
Both Bytes
Table 25 R/W Encodings
R/W[1:0]
Description
00
Reserved
01
Read Only
10
Write Only
11
Read/Write
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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