Cypress Semiconductor CYDC128B16 Bedienungsanleitung PDF herunterladen (Seite 18)

CYDC128B16

Document #: 001-01638 Rev. *H Page 18 of 29

Data hold from write end 0 0 ns

HZWE

[3, 4]

R/W LOW to high Z 15 25 ns

LZWE

[3, 4]

R/W HIGH to low Z 0 0 ns

WDD

[5]

Write pulse to data delay 55 80 ns

DDD

[5]

Write data valid to read data valid 55 80 ns

Busy Timing

[6]

BLA

BUSY LOW from address match 30 45 ns

BHA

BUSY HIGH from address mismatch 30 45 ns

BLC

BUSY LOW from CE LOW 30 45 ns

BHC

BUSY HIGH from CE HIGH 30 45 ns

[7]

Port set up for priority 5 5 ns

R/W HIGH after BUSY (Slave) 0 0 ns

R/W HIGH after BUSY HIGH (Slave) 20 35 ns

BDD

[8]

BUSY HIGH to data valid 30 40 ns

Interrupt Timing

[6]

INS

INT set time 35 45 ns

INR

INT reset time 35 45 ns

Semaphore Timing

SOP

SEM flag update pulse (OE or SEM)10 15 ns

SWRD

SEM flag write to read time 10 10 ns

SPS

SEM flag contention window 10 10 ns

SAA

SEM address access time 40 55 ns

1. To access RAM, CE = L, UB = L, SEM = H. To access semaphore, CE = H and SEM = L. Either condition must be valid for the entire t

SCE

time.

2. At any given temperature and voltage condition for any given device, t

HZCE

is less than t

LZCE

and t

HZOE

is less than t

LZOE.

3. Test conditions used are Load 3.

4. This parameter is guaranteed but not tested. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with

Busy waveform.

5. For information on port-to-port delay through RAM cells from writing port to reading port, refer to Read Timing with Busy waveform.

6. Test conditions used are Load 2.

7. Add 2ns to this value when the I/O ports are operating at different voltages.

8. t

BDD

is a calculated parameter and is the greater of t

WDD

–t

PWE

(actual) or t

DDD

–t

(actual).

Switching Characteristics for V

= 3.0 V Over the Operating Range (continued)

Parameter Description

CYDC128B16 CYDC128B16 Unit

-40 -55

Min Max Min Max

[+] Feedback

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 29 30

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