Cypress CY14B256K Manuel d'utilisateur télécharger pdf (Page 6)

CY14B256K

Document Number: 001-06431 Rev. *H Page 6 of 28

Table 1. Mode Selection

CE WE OE

A13–A0 Mode IO Power

H X X X Not Selected Output High Z Standby

L H L X Read SRAM Output Data Active

L L X X Write SRAM Input Data Active

L H L 0x0E38

0x31C7

0x03E0

0x3C1F

0x303F

0x0FC0

Read SRAM

Nonvolatile STORE

Output Data

Output High Z

Active I

CC2

[1, 2, 3]

L H L 0x0E38

0x31C7

0x03E0

0x3C1F

0x303F

0x0C63

Read SRAM

Nonvolatile RECALL

Output Data

Output High Z

Active

[1, 2, 3]

Notes

1. The six consecutive address locations are in the order listed. WE

is HIGH during all six cycles to enable a nonvolatile cycle.

2. While there are 15 address lines on the CY14B256K, only the lower 14 lines are used to control software modes.

3. IO state depends on the state of OE

. The IO table shown is based on OE Low.

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Cypress CY14B256K Manuel d'utilisateur Page 6