參數(shù)資料
型號: 34C60
廠商: SMSC Corporation
英文描述: PARALLEL PORT INTERFACE CHIP PERIPHERAL SIDE
中文描述: 并行接口芯片外設(shè)端
文件頁數(shù): 19/58頁
文件大?。?/td> 350K
代理商: 34C60
SMSC DS – PPC34C60
Page 26
Rev. 06/01/2001
ADVANCED INFORMATION
CONFIGURATION REGISTER - 1100 (Read/Write)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RST
MAXCNT
SFIFO
rsvrd
RAMSZ1
RAMSZ0
CKSEL1
CKSEL0
The bits in this register define the configuration of the system.
Bit 7:RST
Setting this bit resets the storage elements in the chip.
Bit 6:MAXCNT
When this bit is set, the Max Block Count Registers are used to limit the bus and DRAM accesses.
Bit 5:SFIFO
This bit selects the operating mode of the Read FIFO. Setting this bit causes the internal Read FIFO to operate as a single-
word read-ahead. If this bit is clear, the Read FIFO will operate as a two-word read-ahead.
Bit 4:rsvrd
This bit is reserved and should be written as zeros.
Bits[3:2]:RAMSZ[1:0]
RAMSZ1
RAMSZ0
DRAM BUS WIDTH
0
Selects DRAM data width of 4 bits.
0
1
Selects DRAM data width of 8 bits.
1
X
Selects DRAM data width of 16 bits.
Bits[1:0]:CKSEL[1:0]
CKSEL1
CKSEL0
BUS CYCLE (BUSCLK)
0
Bus Cycle (BUSCLK) = System Clock / 2
0
1
Bus Cycle (BUSCLK) = System Clock / 3
1
0
Bus Cycle (BUSCLK) = System Clock / 5
1
Bus Cycle (BUSCLK) = System Clock / 6
BUSCLK clocks the Bus Interface State Machine responsible for generating Bus Access, DRAM access, and DRAM
Refresh timing. BUSCLK is also responsible for Output Strobe timing. System Clock is the SCLK input (pin 96) and is
typically 24MHz.
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