Signal Descriptions
A-2
Copyright © 2003, 2004. ARM Limited. All rights reserved.
ARM DDI 0306B
A.1
AMBA AHB signals
Table A-1 lists the AMBA AHB common signals.
Table A-2 lists the AMBA AHB slave signals.
Table A-1 AMBA AHB common signals
Name
Type
Source/destination
Description
HCLK
Input
Clock controller
Clock input for all IPCM flops
HRESETn
Input
Reset controller
AHB bus reset, active LOW
Table A-2 AMBA AHB slave signals
Name
Type
Source/destination
Description
HADDR[11:2]
Input
Send or receive core AHB
System address bus
HRDATA[31:0]
Output
Send or receive core AHB
Read data bus
HREADY
Input
Send or receive core AHB
Transfer completed input. When HIGH, this signal
indicates that a transfer has finished on the bus.
HREADYOUT
Output
Send or receive core AHB
Transfer done output. When HIGH, this signal indicates
that a transfer has finished on the bus. This signal can be
driven LOW to extend a transfer. The IPCM is always zero
wait state, therefore this signal is always driven HIGH.
HRESP[1:0]
Output
Send or receive core AHB
The transfer response provides additional information on
the status of a transfer. The IPCM always provides an
OKAY response.
HSEL
Input
Send or receive core AHB
Slave select signal for IPCM control and status registers
HSIZE[2:0]
Input
Send or receive core AHB
Transfer size signal. This signal indicates the size of the
current transfer, which can be byte (8-bit), halfword
(16-bit), or word (32-bit). The IPCM only supports 32-bit
transfers.
HTRANS
Input
Send or receive core AHB
Indicates the type of the current transfer, which can be
NONSEQUENTIAL, SEQUENTIAL, IDLE, or BUSY.
The IPCM only uses
HTRANS[1]
.
HWDATA[31:0]
Input
Send or receive core AHB
Write data bus
HWRITE
Input
Send or receive core AHB
Transfer direction signal. When HIGH, this signal indicates
a write and, when LOW, a read
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from