Yamaha YMF724F 3Ch Interrupt Line, 3Dh Interrupt Pin, 3Eh Minimum Grant, 3Fh Maximum Latency

YMF724F

3Ch: Interrupt Line

Read / Write

Default: 00h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Interrupt Line

b[7:0] ..........Interrupt Line

This register indicates the interrupt channel that INTA# is assigned to.

3Dh: Interrupt Pin

Read Only

Default: 01h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Interrupt Pin

b[7:0] ..........Interrupt Pin

DS-1 supports INTA# only. This register is hardwired to 01h.

3Eh: Minimum Grant

Read Only

Default: 05h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Minimum Grant

b[7:0] ..........Minimum Grant

This register indicates the length of the burst period required by DS-1. This register is hardwired to 05h.

3Fh: Maximum Latency

Read Only

Default: 19h

Access Bus Width: 8, 16, 32-bit

b7

b6

b5

b4

b3

b2

b1

b0

Maximum Latency

b[7:0] ..........Maximum Latency

This register indicates how often DS-1 generates the Bus Master Request.

This register is hardwired to 19h.

September 21, 1998

-16-