Coprocessor Interface Signals - Epson ARM720T Core Cpu Manual

8.2

Coprocessor interface signals

The signals used to interface the ARM720T core to a coprocessor are grouped into four
categories.
The clock and clock control signals include the main processor clock and bus reset:
• HCLK
• EXTCPCLKEN
• HRESETn.
The pipeline-following signals are:
• CPnMREQ
• CPnTRANS
• CPnOPC
• CPTBIT.
The handshake signals are:
• CPnCPI
• EXTCPA
• EXTCPB.
The data signals are:
• EXTCPDIN[31:0]
• EXTCPDOUT[31:0]
• EXTCPDBE.
These signals and their use are described in:
Pipeline-following signals
•
Coprocessor interface handshaking
•
Connecting coprocessors
•
Not using an external coprocessor
•
Undefined instructions
•
Privileged instructions
•
ARM720T CORE CPU MANUAL
on page 8-4
on page 8-5
on page 8-9
on page 8-10
on page 8-10
on page 8-10
EPSON
8: Coprocessor Interface
8-3