Harman Kardon HK 990/230 Service Manual page 36

PIN DESCRIPTION
SYMBOL
CLK
CKE
CS
BA0, BA1
A0 ~ A11
Row Address Strobe,
RAS, CAS, WE Column Address Strobe,
UDQM, LDQM Data Input/Output Mask
DQ0 ~ DQ15 Data Input / Output
VDD / VSS Power Supply / Ground
Data Output Power /
VDDQ / VSSQ
NC
Rev. 1.5 / Feb. 2005
TYPE
The system clock input. All other inputs are registered to the
Clock
SDRAM on the rising edge of CLK
Controls internal clock signal and when deactivated, the SDRAM will
Clock Enable
be one of the states among power down, suspend or self refresh
Chip Select Enables or disables all inputs except CLK, CKE, UDQM and LDQM
Selects bank to be activated during RAS activity
Bank Address
Selects bank to be read/written during CAS activity
Row Address: RA0 ~ RA11, Column Address: CA0 ~ CA7
Address
Auto-precharge flag: A10
RAS, CAS and WE define the operation
Refer function truth table for details
Write Enable
Controls output buffers in read mode and masks input data in write
mode
Multiplexed data input / output pin
Power supply for internal circuits and input buffers
Power supply for output buffers
Ground
No Connection No connection
Synchronous DRAM Memory 64Mbit (4Mx16bit)
HY57V641620E(L/S)T(P)-xI Series
DESCRIPTION
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