TMPR4937 datasheet(514/552 Pages) TOSHIBA

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Chapter 21 Electrical Characteristics

21-8

21.5.4 External Bus Interface AC characteristics

(Tc = 0 – 70°C, VCCIO = 3.3 V ± 0.2 V, VCCInt = 1.5 V ± 0.1 V, VSS = 0 V)

Item

Symbol

Condition

Min.

Max.

Unit

SYSCLK Cycle Time

tCYC_SYSCLK

Buffer fixed: CL=50 pF, 8 mA

7.5

⎯

SYSCLK High Time

tHIGH_SYSCLK Buffer fixed: CL=50 pF, 8 mA

⎯

SYSCLK Low Time

tLOW_SYSCLK Buffer fixed: CL=50 pF, 8 mA

⎯

ADDR[19:5] Output Delay

tVAL_ADDR2

For CL=150 pF, 16 mA buffer

1.5

6.5

CE[7:0]* Output Delay

tVAL_CE

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

OE* Output Delay

tVAL_OE

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

SWE* Output Delay

tVAL_SWE

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

BWE[3:0]* Output Delay

tVAL_BWE

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

ACE Output Delay

tVAL_ACE

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

BUSSPRT* Output Delay

tVAL_DQM

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

DATA[63:0] Output Delay (H

→L, L→H) tVAL_BUS

For CL=50 pF, 16 mA buffer

1.5

6.5 *1)

DATA[31:0] Output Delay (Hi-Z

→Valid) tVAL_DATA2ZV For CL=50 pF, 16 mA buffer

1.5

8.5

DATA[31:0] Ouput Delay (Valid

→Hi-Z)

tVAL_DATA2VZ For CL=50 pF, 16 mA buffer

1.5

8.5

DATA[31:0] Input Setup Time

tSU_DATA2

6.0

⎯

DATA[31:0] Input Hold Time

tHO_DATA2

0.5

⎯

ACK* Output Delay (H

→L, L→H)

tVAL_ACK

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

ACK* Output Delay (Hi-Z

→Valid)

tVAL_ACKZV

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

ACK* Output Delay (Valid

→Hi-Z)

tVAL_ACKVZ

Buffer fixed: CL=50 pF, 8 mA

1.5

8.5

ACK* Input Setup Time

tSU_ACK

6.0

⎯

ACK* Input Hold Time

tHO_ACK

0.5

⎯

*1) When the speed of the External Bus is set to 1/3 speed, the delay becomes the GBUSCLK cycle +

6.5 ns. EBCCRn.SP of the External Bus Controller sets the speed of the External Bus.

Figure 21.5.5 Timing Diagram: External Bus Interface

tSU_*

tHO_*

outputs valid

inputs valid

tVAL_*

SYSCLK

OUTPUT

INPUT

tCYC_SYSCLK

tHIGH_SYSCL

tLOW_SYSCL

TMPR4937 Datasheet(PDF) 514 Page - Toshiba Semiconductor

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