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CY7C025AV Datasheet(PDF) 7 Page - Cypress Semiconductor |
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CY7C025AV Datasheet(HTML) 7 Page - Cypress Semiconductor |
7 / 20 page CY7C024AV/024BV/025AV/026AV CY7C0241AV/0251AV/036AV Document #: 38-06052 Rev. *M Page 7 of 20 Table 1. Non-Contending Read/Write Inputs Outputs Operation CE R/W OE UB LB SEM IO9–IO17 IO0–IO8 H X X X X H High Z High Z Deselected: Power Down X X X H H H High Z High Z Deselected: Power Down L L X L H H Data In High Z Write to Upper Byte Only L L X H L H High Z Data In Write to Lower Byte Only L L X L L H Data In Data In Write to Both Bytes L H L L H H Data Out High Z Read Upper Byte Only L H L H L H High Z Data Out Read Lower Byte Only L H L L L H Data Out Data Out Read Both Bytes X X H X X X High Z High Z Outputs Disabled H H L X X L Data Out Data Out Read Data in Semaphore Flag X H L H H L Data Out Data Out Read Data in Semaphore Flag H X X X L Data In Data In Write DIN0 into Semaphore Flag X X H H L Data In Data In Write DIN0 into Semaphore Flag L X X L X L Not Allowed L X X X L L Not Allowed Table 2. Interrupt Operation Example (assumes BUSYL = BUSYR = HIGH)[10] Left Port Right Port Function R/WL CEL OEL A0L–13L INTL R/WR CER OER A0R–13R INTR Set Right INTR Flag L L X FFF[13] XX X X X L[12] Reset Right INTR Flag X X X X X X L L FFF (or 1/3FFF) H[11] Set Left INTL Flag XXX X L[11] L L X 1FFE (or 1/3FFE) X Reset Left INTL Flag X L L 1FFE[13] H[12] XX X X X Table 3. Semaphore Operation Example Function IO0–IO17 Left IO0–IO17 Right Status No action 1 1 Semaphore-free Left port writes 0 to semaphore 0 1 Left Port has semaphore token Right port writes 0 to semaphore 0 1 No change. Right side has no write access to semaphore Left port writes 1 to semaphore 1 0 Right port obtains semaphore token Left port writes 0 to semaphore 1 0 No change. Left port has no write access to semaphore Right port writes 1 to semaphore 0 1 Left port obtains semaphore token Left port writes 1 to semaphore 1 1 Semaphore-free Right port writes 0 to semaphore 1 0 Right port has semaphore token Right port writes 1 to semaphore 1 1 Semaphore free Left port writes 0 to semaphore 0 1 Left port has semaphore token Left port writes 1 to semaphore 1 1 Semaphore-free Notes 10. See Functional Description on page 5 for specific highest memory locations by device. 11. If BUSYR=L, then no change. 12. If BUSYL=L, then no change. 13. See Functional Description on page 5 for specific addresses by device. [+] Feedback |
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