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HM534253BZ-6 Datasheet(PDF) 11 Page - Elpida Memory |
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HM534253BZ-6 Datasheet(HTML) 11 Page - Elpida Memory |
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11 / 45 page  HM534253B Series Data Sheet E0165H10 11 SAM start address must be determined by read transfer cycle or pseudo transfer cycle (split transfer cycle isn’t available) before SAM access, after power on, and determined for each transfer cycle. Read Transfer Cycle ( CAS high, DT/OE low, WE high and DSF low at the falling edge of RAS) This cycle becomes read transfer cycle by driving DT/OE low, WE high and DSF low at the falling edge of RAS. The row address data (512 × 4 bits) determined by this cycle is transferred to SAM data register synchronously at the rising edge of DT/OE. After the rising edge of DT/OE, the new address data outputs from SAM start address determined by column address. In read transfer cycle, DT/OE must be risen to transfer data from RAM to SAM. This cycle can access SAM even during transfer (real time read transfer). In this case, the timing t SDD (min) specified between the last SAM access before transfer and DT/OE rising edge and t SDH (min) specified between the first SAM access and DT/OE rising edge must be satisfied. (See figure 3.) When read transfer cycle is executed, SI/O becomes output state by first SAM access. Input must be set high impedance before t SZS (min) of the first SAM access to avoid data contention. RAS CAS Address DT/OE SC SI/O SAM Data before Transfer SAM Data after Transfer tSDD tSDH L Xi Yj Yj Yj + 1 DSF Figure 3 Real Time Read Transfer Pseudo Transfer Cycle ( CAS high, DT/OE low, WE low, SE high and DSF low at the falling edge of RAS) Pseudo transfer cycle switches SI/O to input state and set SAM start address without data transfer to RAM. This cycle starts when CAS is high, DT/OE low, WE low, SE high and DSF low at the falling edge of RAS. Data should be input to SI/O later than t SID (min) after RAS becomes low to avoid data contention. SAM access becomes enabled after t SRD (min) after RAS becomes high. In this cycle, SAM access is inhibited during RAS low, therefore, SC must not be risen. Write Transfer Cycle ( CAS high, DT/OE low, WE low, SE low, and DSF low at the falling edge of RAS) |
Similar Part No. - HM534253BZ-6 |
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Similar Description - HM534253BZ-6 |
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