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參數(shù)資料
型號(hào): W90221F
廠商: WINBOND ELECTRONICS CORP
英文描述: PA-RISC Embedded Micro-Controller(惠普PA-RISC結(jié)構(gòu)的32位嵌入式微控制器)
中文描述: PA - RISC的嵌入式微控制器(惠普的PA - RISC結(jié)構(gòu)的32位嵌入式微控制器)
文件頁數(shù): 20/174頁
文件大小: 2102K
代理商: W90221F
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The above information is the exclusive intellectual property of Winbond Electronics and shall not be disclosed, distributed or reproduced without permission from Winbond.
20
Versi on 0. 4, March/2000
Features :
supports up to 2 banks of EDO-DRAM (SIMM) or SDRAM (DIMM or ON BOARD)
32-bit data interface
CAS#-befor-RAS# refresh cycles for DRAM module
programmable RAS#/CAS# timing for DRAM access
programmable address setup time for DRAM access.
only supports a burst length of one and burst type of sequential.
programmable CAS# latency access time.
provide 1M, 2M, 4M, 8M, 16M DRAM with page size 256 bytes, 512 bytes, 1K bytes,
2K bytes, 4K bytes configuration.
Related Pins :
- CS0L#/RAS0#, CS1L#/RAS1#_ (out) :
During EDO mode, these signals are served as RAS0#, RAS1# that used to latch the row address on
the
MA[0:11] lines into the DRAM. Each signal is used to select one DRAM bank.
During SDRAM mode, these signals are served as CS0L#, CS1L# that indicates the
command decoder
is enable or disable.
- CS0H#, CS1H# (out) :
Same as above CS0L#/CS1L#, when using on board SDRAM, it has been reserved and no effect on
access, when using external DIMM module, these signals indicates current access on
the high 32 bits
of 64-bit DIMM.
- RAS#, CAS# (out) :
This signals along with WE# and CS# define the command is being entered when using SDRAM
configuration.
- WE# (out) :
This signals asserted indicates a write cycle to DRAM.
- CAS[0:3]#/DQMB[0:3] (out) :
EDO mode: these signals are served as CAS# function and used to latch the column address on the
Command/Address
Decode
DRAM
registers
DRAM state
machine
486 CPU bus
Refresh counter
Data Buffer
Control
MA Generator
CS0L#, CS0H#, CS1L#, CS1H#, RAS#,
CAS#, WE#, CKE, MCLK, DQMB[0:3]
BA[1:0], MA[11:0]
MD[0:31]]
14.318 Mhz
Fig 5.4-1 MEMC Block Diagram
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