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FM28V202-TG 데이터시트(PDF) 3 Page - Cypress Semiconductor |
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FM28V202-TG 데이터시트(HTML) 3 Page - Cypress Semiconductor |
3 / 18 page FM28V202 - 128Kx16 F-RAM Document Number: 001-86602 Rev. ** Page 3 of 18 Table 1. Functional Truth Table 1,2 /CE /WE A(16:2) A(1:0) /ZZ Operation X X X X L Sleep Mode H X X X X X X X H Standby/Idle L H H V V V V H Read L H No Change Change H Page Mode Read L H Change V H Random Read L L L V V V V H /CE-Controlled Write 2 L V V H /WE-Controlled Write 2, 3 L No Change V H Page Mode Write 4 L X X X X X X H Starts Precharge Notes: 1) H=Logic High, L=Logic Low, V=Valid Data, X=Don’t Care. 2) For write cycles, data-in is latched on the rising edge of /CE or /WE, whichever comes first. 3) /WE-controlled write cycle begins as a Read cycle and A(16:2) is latched then. 4) Addresses A(1:0) must remain stable for at least 15 ns during page mode operation. Table 2. Byte Select Truth Table /WE /OE /LB /UB Operation H H X X Read; Outputs Disabled X H H H L H L Read upper byte; Hi-Z lower byte L H Read lower byte; Hi-Z upper byte L L Read both bytes L X H L Write upper byte; Mask lower byte L H Write lower byte; Mask upper byte L L Write both bytes The /UB and /LB pins may be grounded if 1) the system does not perform byte writes and 2) the device is not configured as a 256Kx8. Simplified Sleep/Standby State Diagram Initialize Normal Operation Standby Sleep Power Applied /ZZ low /ZZ high /CE high, /ZZ high /CE low, /ZZ high /CE low, /ZZ high /ZZ low /CE high, /ZZ high |
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