TFB2002BI

FUTUREBUS+ I/O CONTROLLER

SLLS182 – AUGUST 1994

5

POST OFFICE BOX 655303

Terminal Functions

interface to TFB2022A

TERMINAL

I/O

FROM/TO

DESCRIPTION

NAME

NO.

I/O

FROM/TO

DESCRIPTION

DATAAV*

18

I

TFB2022A DPU

Data available in FIFO. In compelled mode, DATAAV* indicates if any data is in the

FIFO. In packet or burst mode, DATAAV* indicates if a packet or burst data of length

encoded on the Futurebus packet size or the DL < 1:0 > lines is available.

DMAMODE

17

O

TFB2022A DPU

DMA operation is occurring. DMAMODE turns off critical word first on the TFB2022A.

ERROR <1:0 >

198, 197

I

TFB2022A DPU

Futurebus+ error indicators:

LL

LH

HL

HH

No error

Futurebus+ parity error

Packet longitudinal parity error

Host-bus parity error

FADEC < 3:0 >

29, 30

I

TFB2022A DPU

Futurebus+ address decode:

31, 33

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

Reserved

Reserved

Mailbox address

Packet-mode-capable memory address

Reserved

Reserved

Reserved

DPU CSR

Broadcast CSR (non-DPU)

Broadcast CSR (DPU)

FIFORST*

199

O

TFB2022A DPU

FIFO reset. FIFORST* resets the FIFO pointers.

FACK

41

I

TFB2022A DPU

Futurebus+ acknowledge. FACK indicates Futurebus+ event is complete

FMODE < 2:0 >

34, 35, 37

O

TFB2022A DPU

Futurebus+ mode. FMODE < 2:0 > indicates to the TFB2022A what action is to be

taken in the Futurebus+ interface:

LLL

LLH

LHL

LHH

HLL

HLH

HHL

HHH

Compelled-mode Futurebus+

Packet-mode Futurebus+

Partial transfer

Disconnect data for master write

Reserved

Reserved

Disconnect data for split requestor

Reserved

FRD*

38

O

TFB2022A DPU

Futurebus+ read/write indicator: L = read from Futurebus+ to FIFO; H = write from

FIFO to Futurebus+

FSTRB

39

O

TFB2022A DPU

Futurebus+ strobe. FSTRB performs next Futurebus+ event