Irradio DVD-636, Service Manual

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22
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 except CLK, CKE and L(U)DQM
Masks system clock to freeze operation from the next clock cycle.
CKE Clock Enable 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.
DW0-15 Data Input/Output Data inputs/outputs are multiplexed on the same pins.