Specifications

B.2.1 AHB bus timing

Table B-5 lists the timing for the AHB buses. (The bus clock frequency is typically 35MHz for a tcyc of 28.5ns).

Table B-5 ARM926EJ-S PXP Development Chip bus timing

Bus signals

Clock

tov

toh

tis

tih

 

 

 

 

 

 

HRESETn input

XTALCLKEXT

-

-

10ns

2ns

 

 

 

 

 

 

AHB M1 outputs in synchronous mode (HADDR, HSELx,

XTALCLKEXT

16ns

1ns

-

-

HWRITE, HTRANS[1:0], HSIZE[2:0], HBURST[2:0], and

 

 

 

 

 

write data)

 

 

 

 

 

 

 

 

 

 

 

AHB M1 inputs in synchronous mode (HREADY, HRESP,

XTALCLKEXT

-

-

17ns

0ns

HLOCK, and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB M1 outputs in async mode (HADDR, HSELx, HWRITE,

HCLKM1

18ns

4ns

-

-

HTRANS[1:0], HSIZE[2:0], HBURST[2:0], and write data)

 

 

 

 

 

 

 

 

 

 

 

AHB M1 inputs in async mode (HREADY, HRESP, HLOCK,

HCLKM1

-

-

17ns

4.5ns

and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB M2 outputs in synchronous mode (HADDR, HSELx,

XTALCLKEXT

16ns

1ns

-

-

HWRITE, HTRANS[1:0], HSIZE[2:0], HBURST[2:0], and

 

 

 

 

 

write data)

 

 

 

 

 

 

 

 

 

 

 

AHB M2 inputs in synchronous mode (HREADY, HRESP,

XTALCLKEXT

-

-

17ns

0ns

HLOCK, and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB M2 outputs in async mode (HADDR, HSELx, HWRITE,

HCLKM2

18ns

4ns

-

-

HSIZE[2:0], HBURST[2:0], and write data)

 

 

 

 

 

 

 

 

 

 

 

AHB M2 inputs in async mode (HREADY, HRESP, HLOCK,

HCLKM2

-

-

17ns

4.5ns

and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB S outputs in synchronous mode (HREADY, HRESP,

XTALCLKEXT

16ns

1ns

-

-

HLOCK, and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB S inputs in synchronous mode (HADDR, HSELx,

XTALCLKEXT

-

-

17ns

0ns

HWRITE, HTRANS[1:0], HSIZE[2:0], HBURST[2:0], and

 

 

 

 

 

write data)

 

 

 

 

 

 

 

 

 

 

 

AHB S outputs in async mode (HREADY, HRESP, HLOCK,

HCLKS

18ns

4ns

-

-

and read data)

 

 

 

 

 

 

 

 

 

 

 

AHB S inputs in async mode (HADDR, HSELx, HWRITE,

HCLKS

-

-

17ns

4.5ns

HTRANS[1:0], HSIZE[2:0], HBURST[2:0], and write data)

 

 

 

 

 

 

 

 

 

 

 

B-6

Copyright © 2003-2010 ARM Limited. All rights reserved.

ARM DUI 0224I

Page 314
Image 314
ARM ARM DUI 0224I manual AHB bus timing, HRESETn input, Hwrite , HTRANS10 , HSIZE20 , HBURST20