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IS66WVE1M16ECLL-70BLI Datasheet(PDF) 8 Page - Integrated Silicon Solution, Inc |
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IS66WVE1M16ECLL-70BLI Datasheet(HTML) 8 Page - Integrated Silicon Solution, Inc |
8 / 34 page 8 IS66/67WVE1M16EALL/EBLL/ECLL IS66/67WVE1M16TALL/TBLL/TCLL Rev. C | Oct. 2015 www.issi.com - SRAM@issi.com Bus Operating Modes PSRAM products incorporates the industry-standard, asynchronous interface. This bus interface supports asynchronous Read and WRITE operations as well as page mode READ operation for enhanced bandwidth. The supported interface is defined by the value loaded into the CR. Asynchronous Mode Operation PSRAM products power up in the asynchronous operating mode. This mode uses the industry- standard SRAM control interface (CE#, OE#, WE#, and LB#/UB#). READ operations are initiated by bringing CE#, OE#, and LB#/UB# LOW while keeping WE# HIGH (see Figure 2). Valid data will be driven out of the I/Os after the specified access time has elapsed. WRITE operations occur when CE#,WE#, and LB#/UB# are driven LOW (see Figure 3). During WRITE operations, the level of OE# is a “Don’t Care”; WE# overrides OE#. The data to be written is latched on the rising edge of CE#, WE#, or LB#/UB#, whichever occurs first. WE# LOW time must be limited to tCEM. Address DQ0- DQ15 CE# UB#/LB# OE# WE# VALID ADDRESS VALID DATA Figure 2. Asynchronous Read Operation tRC = READ cycle Time < tCEM Notes: 1. tCEM during Asynchronous Write Operation does not apply to IS66/67WVE1M16TALL/BLL/CLL. (1) |
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