參數(shù)資料
型號(hào)： KM4216C258
廠商： SAMSUNG SEMICONDUCTOR CO. LTD.
英文描述： 256K x 16 Bit CMOS Video RAM(256K x 16 位 CMOS視頻RAM)
中文描述： 256K × 16位的CMOS視頻RAM（256K × 16位的CMOS視頻內(nèi)存）
文件頁(yè)數(shù)： 2/41頁(yè)
文件大小： 772K
代理商： KM4216C258
KM4216C258
CMOS VIDEO RAM
Rev. 0.1 (Mar. 1998)
PIN DESCRIPTION
SYMBOL
TYPE
DESCRIPTION
RAS
IN
Row address strobe. RAS is used to clock in the 9 row bits for another input signal. The RAM port is
placed in standby mode when the RAS control is held "high"
CASL,CASU
IN
Column address strobe. CASL, CASU are used to clock in the 9 column address bits as a strobe
forthe DSF inputs and used to Byte/Word Read, Write Operation.
Address
IN
Address inputs for the DRAM operation, these inputs are multiplexed and clocked by RAS and CAS
to select one 16-bit word out of the 262,144 available. 9 row address bits are latched on the falling
edge of the row address strobe (RAS) and the following 9 column address bits are latched on the
falling edge of the column address strobe (CAS).
WB/WE
IN
The WB/WE input is a multi-function pin. When WB/WE is "High" at the falling edge of RAS,
during RAM port operation, it is used to write data into the memory array in the same as a standard
DRAM. When WB/WE is "Low" at the falling edge of RAS, during RAM port operation, the W-P-B
function is enabled.
DT/OE
IN
The DT/OE input is also a multi-function pin. Enables an internal Transfer operation at the falling
edge of RAS when Transfer is enable.
DSF
IN
DSF is used to indicate which special functions (BW, FW, Split Transfer, etc.) are used for a particu-
lar access cycle.
Wi/DQi
IN/OUT
Data I/O for DRAM access. These pins act as inputs for Mask and register load cycles, DQ Mask and
Column Mask for BW.
SC
IN
Clock input to the serial address counter and data latch for the SAM register.
SQi
OUT
Serial output pin for serial read.(Serial write is not supported)
QSF
OUT
QSF indicates which half of the SAM is being accessed. Low if address is 0~255, High if address is
256~511.
SE
IN
In a serial read cycle, SE is used as an output control. When SE is "High", serial access is disabled,
however, the serial address pointer is still incremented while SC is clocked.
V
CC
SUPPLY
Power supply
V
SS
SUPPLY
Ground
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