Cypress Semiconductor CY7C1380C Manual de usuario descargar pdf (Pagina 9)

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CY7C1380C

CY7C1382C

Document #: 38-05237 Rev. *B Page 9 of 28

Continue Read Next 0 X X 1 X 1 0 0 DQ Read

Suspend Read Current 0 X X X 1 1 1 1 Hi-Z Read

Suspend Read Current 0 X X X 1 1 1 0 DQ Read

Suspend Read Current 0 X X 1 X 1 1 1 Hi-Z Read

Suspend Read Current 0 X X 1 X 1 1 0 DQ Read

Begin Write Current 0 X X X 1 1 1 X Hi-Z Write

Begin Write Current 0 X X 1 X 1 1 X Hi-Z Write

Begin Write External 0 0 1 0 1 0 X X Hi-Z Write

Continue Write Next 0 X X X 1 1 0 X Hi-Z Write

Continue Write Next 0 X X 1 X 1 0 X Hi-Z Write

Suspend Write Current 0 X X X 1 1 1 X Hi-Z Write

Suspend Write Current 0 X X 1 X 1 1 X Hi-Z Write

ZZ “sleep” None 1XXX X X XXHi-ZX

Write Cycle Descriptions

[1, 5, 6]

Function (1380C) GW BWE BWdBWcBWbBWa

Read 11XXXX

Write Byte 0 – DQa 101110

Write Byte 1 – DQb 101101

Write Bytes 1, 0 101100

Write Byte 2 – DQc 101011

Write Bytes 2, 0 101010

Write Bytes 2, 1 101001

Write Bytes 2, 1, 0 1 0 1 0 0 0

Write Byte 3 – DQd 100111

Write Bytes 3, 0 100110

Write Bytes 3, 1 100101

Write Bytes 3, 1, 0 1 0 0 1 0 0

Write Bytes 3, 2 100011

Write Bytes 3, 2, 0 1 0 0 0 1 0

Write Bytes 3, 2, 1 1 0 0 0 0 1

Write All Bytes 1 0 0 0 0 0

Write All Bytes 0 X X X X X

Function (1382C) GW

BWE BWbBWa

Read 1 1 X X

Write Byte 0 – DQ

[7:0]

and DP

1010

Write Byte 1 – DQ

[15:8]

and DP

1001

Write All Bytes 1 0 0 0

Write All Bytes 0 X X X

Notes:

5. The SRAM always initiates a read cycle when ADSP

asserted, regardless of the state of GW, BWE, or BW

Writes may occur only on subsequent clocks after

the ADSP

or with the assertion of ADSC. As a result, OE must be driven HIGH prior to the start of the write cycle to allow the outputs to three-state. OE is a

“don't care” for the remainder of the write cycle.

6. OE

is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles. During a read cycle DQ = High-Z when OE is inactive

or when the device is deselected, and DQ = data when OE is active.

Cycle Descriptions (continued)

[1, 2, 3, 4]

Next Cycle Add. Used ZZ CE

ADSP ADSC ADV OE DQ Write

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 27 28

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