Daewoo DHC - 2300K, Service Manual

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33
Component Descriptions
Block Diagram
Pin Descriptions
Symbol Name Description
CLK System Clock Active on the positive going edge to sample all inputs.
CS Chip Select
Disables or Enables device operation by masking or enabling
all inputs exceptCLK, CKE and L(U)DQM
CKE Clock Enable
Masks system clock to freeze operation from the next clock
cycle.
CKE should be enabled at least one clock + tss prior to new
command.
Disable input buffers for power down in standby.
A0~A10/AP Address
Row / Column addresses are multiplexed on the same pins.
Row address : RA0~RA10, Column address: CA0~CA7
BA Bank Select Address
Selects bank to be activated during row address latch time.
Selects band for read/write during column address latch time.
RAS Row Address Strobe
Latches row addresses on the positive going edge of the
CLK with RAS low.
Enables row access & precharge.
CAS Column Address Strobe
Latches column addresses on the positive going edge of the
CLK with CAS low. Enables column access.
WE Write Enable Enables write operation and Row precharge.
L(U)DQM Data Input/Output Mask
Makes data output Hi-Z, t SHZ after the clock and masks the
output.
Blocks data input when L(U)DQM active.
D
Q0-15
Data Input/Output Data inputs/outputs are multiplexed on the same pins.
VDD/VSS Power Supply/Ground Power Supply: +3.3V±0.3V/Ground
VDDQ/VSSQ
Data Output
Power/Ground
Provide isolated Power/Ground to DQs for improved noise
immunity.
NC/RFU No Connection