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HM534253B Datasheet(PDF) 6 Page - Elpida Memory |
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HM534253B Datasheet(HTML) 6 Page - Elpida Memory |
6 / 45 page HM534253B Series Data Sheet E0165H10 6 I/O0 – I/O3 (input/output pins): I/O pins function as mask data at the falling edge of RAS (in mask write mode). Data is written only to high I/O pins. Data on low I/O pins are masked and internal data are retained. After that, they function as input/output pins as those of a standard DRAM. In block write cycle, they function as address mask data at the falling edges of CAS. DT/OE (input pin): DT/OE pin functions as DT (data transfer) pin at the falling edge of RAS and as OE (output enable) pin after that. When DT is low at the falling edge of RAS, this cycle becomes a transfer cycle. When DT is high at the falling edge of RAS, RAM and SAM operate independently. SC (input pin): SC is a basic SAM clock. In a serial read cycle, data outputs from an SI/O pin synchronously with the rising edge of SC. In a serial write cycle, data on an SI/O pin at the rising edge of SC is fetched into the SAM data register. SE(input pin): SE pin activates SAM. When SE is high, SI/O is in the high impedance state in serial read cycle and data on SI/O is not fetched into the SAM data register in serial write cycle. SE can be used as a mask for serial write because internal pointer is incremented at the rising edge of SC. SI/O0 – SI/O3 (input/output pins): SI/Os are input/output pins in SAM. Direction of input/output is determined by the previous transfer cycle. When it was a read transfer cycle, SI/O outputs data. When it was a pseudo transfer cycle or write transfer cycle, SI/O inputs data. DSF (input pin): DSF is a special function data input flag pin. It is set to high at the falling edge of RAS when new functions such as color register read/write, split transfer, and flash write, are used. DSF is set to high at the falling edge of CAS when block write is executed. QSF (output pin): QSF outputs data of address A8 in SAM. QSF is switched from low to high by accessing address 255 in SAM and from high to low by accessing 511 address in SAM. |
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