HY5DU56422AT Datasheet, PDF (6/36 Pages) Hynix Semiconductor – 256M-S DDR SDRAM

FUNCTIONAL BLOCK DIAGRAM (64Mx4)
4Banks x 16Mbit x 4 I/O Double Data Rate Synchronous DRAM
HY5DU56422A(L)T
HY5DU56822A(L)T
HY5DU561622A(L)T
CLK
/CLK
CKE
/CS
/RAS
/CAS
/WE
Command
Decoder
Bank
Control
Write Data Register
4
2-bit Prefetch Unit
8
16Mx4 / Bank0
16Mx4 / Bank1
16Mx4 / Bank2
8
4
Mode
Register
Row
Decoder
16Mx4 / Bank3
DQS
DM
DQ[0:3]
ADD
Address
BA
Buffer
Column Decoder
Column Address
Counter
CLK_DLL
DQS
DQS
Data Strobe
Transmitter
Data Strobe
Receiver
CLK,
/CLK
DLL
Block
Mode
Register
Rev. 0.4/ May. 02
6