- Linux MultiMedia Studio Computer Accessories User Manual

Mint v4 PC Programming Guide

MN1278 05.2001

6.9 Special Functions Registers

Address Use Symbolic Constant

0x3F8

ICM Handshaking roICM_HANDSHAKE

0x3F9

Data associated with events roINTERRUPT_DATA_1

0x3FA

Data associated with events roINTERRUPT_DATA_2

0x3FB

Application Code Register roAPPLICATION_CODE

0x3FC

Functionality Code Register roFUNCTION_CODE

0x3FD

Scratchpad Register roSCRATCH_PAD

The way in which dual port RAM is used may vary from application to application. All applications should use

the registers detailed in this document in the same way. This will allow host resident code to determine whether

it recognizes the application and the protocol used for communication.

There is no hardware restriction upon those locations that may be read or written from either side. Both

NextMove and the host have full read and write access to all locations.

Application Code Register (3FB)

This register identifies the software running on NextMove. The host may use this to determine how to

communicate with the software or better interpret the bits within the Functionality Code Register. Each

application program should have a unique identifier. Of the 65536 possible codes, the first half are reserved.

Codes 32768 to 65535 may be used to identify user programs. Application programs should prime this register

after all other initialization. It is recommended that the host does not write to this location.

Code Description Of Program Symbolic Constant

0 Unidentified program or no program

running.

apNONE

1 Loader running. apLOADER

2 Immediate Command Mode

supported.

apFRONT

3 NextMove test program running. apNM_TEST

4 Mint for NextMove suported. apNM_MINT

5 Mint for NextMove suported. apFRONT_MINT

6 Custom Version. apRPD_MINT

7 Mint Motion Library. (Embedded) apMML

8+ Reserved