P2V28S40ATP-8 查看數據表（PDF） - Vanguard International Semiconductor

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P2V28S40ATP-8

128Mb SDRAM Specification

Vanguard International Semiconductor  

128Mb Synchronous DRAM

P2V28S20ATP-7,-75,-8 (4-BANK x 8,388,608-WORD x 4-BIT)

P2V28S30ATP-7,-75,-8 (4-BANK x 4,194,304-WORD x 8-BIT)

P2V28S40ATP-7,-75,-8 (4-BANK x 2,097,152-WORD x 16-BIT)

BASIC FUNCTIONS

The P2V28S20 , 30 and 40ATP provides basic functions,

bank (row) activate, burst read / write, bank (row) precharge,

and auto / self refresh.

Each command is defined by control signals of /RAS, /CAS and

/WE at CLK rising edge. In addition to 3 signals, /CS ,CKE and

A10 are used as chip select, refresh opt ion, and precharge

option, respectively .

To know the detailed definition of commands, please see the com-

mand truth table.

CLK

/CS

/RAS

/CAS

/WE

CKE

A10

Chip Select : L=select, H=deselect

Command

Command

define basic command

Command

Refresh Option @ refresh command

Precharge Option @ precharge or read/write command

Activate (ACT) [/RAS =L, /CAS =/WE =H]

ACT command activates a row in an idle bank indicated by BA.

Read (READ) [/RAS =H, /CAS =L, /WE =H]

READ command starts burst read from the active bank indicated by BA. First output

data appears after /CAS latency. When A10 =H at this command, the bank is deac-

tivated after the burst read (auto-precharge, READA).

Write (WRITE) [/RAS =H, /CAS =/WE =L]

WRITE command starts burst write to the active bank indicated by BA. Total data

length to be written is set by burst length. When A10 =H at this command, the bank

is deactivated after the burst write (auto-precharge, WRITEA).

Precharge (PRE) [/RAS =L, /CAS =H, /WE =L]

PRE command deactivates the active bank indicated by BA. This command also

terminates burst read / write operation. When A10 =H at this command, all banks

are deactivated (precharge all, PREA ).

Auto-Refresh (REFA) [/RAS =/CAS =L, /WE =CKE =H]

REFA command starts auto-refresh cycle. Refresh address including bank address

are generated internally. After this command, the banks are precharged automatically.

JULY.2000

Page-5

Rev.2.2

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