TFB2002BI

FUTUREBUS+ I/O CONTROLLER

SLLS182 – AUGUST 1994

6

POST OFFICE BOX 655303

Terminal Functions

interface to TFB2022A (continued)

TERMINAL

I/O

FROM/TO

DESCRIPTION

NAME

NO.

I/O

FROM/TO

DESCRIPTION

HADEC < 3:0 >

9, 10,

I

TFB2022A DPU

Host address decode. Address decoding for the host-interface address:

11, 13

Slave encoding:

Master encoding:

LLLL

LLLH

LLHL

LLHH

LHLL

LHLH

LHHL

LHHH

HLLL

HLLH

HLHL

HLHH

HHLL

HHLH

HHHL

HHHH

Unselected

Host memory

Host extended-unit space

Host CSR

Broadcast mailbox

Reserved

Split response hit

Futurebus+ CSR address

Reserved

Broadcast CSR address

Reserved

Reserved

Reserved

DPU CSR

Reserved

Reserved

LLLL

LLLH

LLHL

LLHH

LHLL

LHLH

LHHL

LHHH

HLLL

HLLH

HLHL

HLHH

HHLL

HHLH

HHHL

HHHH

Unselected

Memory address compelled

Maximum capable burst or

extended unit space

Memory address 64-byte

burst

32-byte-memory-address

capable

16-byte-memory-address

capable

8-byte-memory-address

capable

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

HBADLD*

201

O

TFB2022A DPU

Host address load. Futurebus+ has been granted for the requested transaction out-

put.

HBMASTER*

182

O

TFB2022A DPU

Host master. This device is mastering the host bus transaction.

HMODE < 2:0 >

5, 6, 7

O

TFB2022A DPU

Host mode. HMODE < 2:0 > indicates to the TFB2022A what action is to be taken in

the host interface:

LLL

LLH

LHL

LHH

HLL

HLH

HHL

HHH

Reserved

Between FIFO and host interface (single transfer), between

TFB2022A resident CSR and host interface, or between

TFB2022A resident CSR and FIFO

From FIFO to TFB2022A resident CSR.

Reserved

Reserved

Between FIFO and host interface (burst mode)

Reserved

Reserved

HSTRB*

3

O

TFB2022A DPU

Host strobe. HSTRB* performs next host-interface request as indicated in

HMODE < 2:0 >.

NEWADDR*

21

O

TFB2022A DPU

New address. NEWADDR* increments address in the TFB2022A address register.

SELECTED*

42

O

TFB2022A DPU

Module selected. Futurebus+ transaction uses this module. The DPU is used as a slave

of the Futurebus+ transaction

SPACEAV*

19

I

TFB2022A DPU

Space available in FIFO. In compelled mode, SPACEAV* indicates that space is

available in the FIFO for another transfer. In packet or burst mode, SPACEAV* indicates

that space is available in the FIFO for another packet or burst

UNALIGNED*

202

I

TFB2022A DPU

FB+ slave partial unaligned operation