TFB2022AI

FUTUREBUS+ DATA PATH UNIT

SLLS183 − AUGUST 1994

4

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Terminal Functions

other module interface signals

TERMINAL

I/O

FROM/TO

DESCRIPTION

NAME

NO.

I/O

FROM/TO

DESCRIPTION

MS<1:0>

33, 34

O

Module

Memory decode of the host address:

LL

Unselected

LH

Host memory

HL

Host-unit space

HH

CSR space

REFCLK

151

I

Module

Clock input. A 25-MHz, 50%

±5% duty-cycle signal is recommended; any frequency

between 25 MHz and 33 MHz and duty cycle of 50%

±5% can be tolerated. REFCLK

determines packet-mode transfer speed.

interface to TFB2002A

TERMINAL

I/O

FROM/TO

DESCRIPTION

NAME

NO.

I/O

FROM/TO

DESCRIPTION

DATAAV*

153

O

TFB2002B IOC

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

DMAMODE

154

I

TFB2002B IOC

DMA operation is occurring. FMODE and HMODE are modified for this function.

ERROR<1:0>

21, 22

O

TFB2002B IOC

Futurebus+ error indicators:

LL

No error

LH

Futurebus+ parity error

HL

Packet longitudinal error

HH

Host-interface-data parity error

FADEC<3:0>

143, 142,

141, 139

O

TFB2002B IOC

Futurebus+ address decode:

LLLL

Unselected

LLLH

Host memory

LLHL

Host-extended-unit space

LLHH

Host CSR

LHLL

Broadcast mailbox

LHLH

Reserved

LHHL

Reserved

LHHH

Reserved

HLLL

Mailbox address

HLLH

Packet-mode-capable memory address

HLHL

Reserved

HLHH

Reserved

HHLL

Reserved

HHLH

DPU CSR

HHHL

Broadcast CSR (non-DPU)

HHHH

Broadcast CSR (DPU)

FIFORST*

19

I

TFB2002B IOC

FIFO reset. FIFORST* resets the FIFO pointers

FACK

133

O

TFB2002B IOC

Futurebus+ acknowledge. Futurebus+ event complete

FMODE<2:0>

138, 137,

136

I

TFB2002B IOC

Futurebus+ mode. FMODE<2:0> indicates to the TFB2022AI what action is to be

taken in the Futurebus+ interface:

LLL

Compelled-mode Futurebus+

LLH

Packet-mode Futurebus+

LHL

Partial transfer

LHH

Disconnect data for master write

HLL

Reserved

HLH

Reserved

HHL

Disconnect data for split requestor

HHH

Reserved