TFB2002B Datasheet, PDF (5/13 Pages) Texas Instruments – FUTUREBUS+ I/O CONTROLLER

TFB2002BI
FUTUREBUS+ I/O CONTROLLER
Terminal Functions
SLLS182 – AUGUST 1994
interface to TFB2022A
TERMINAL
I/O
FROM/TO
NAME
NO.
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
No error
LH
Futurebus+ parity error
HL
Packet longitudinal parity error
HH
Host-bus parity error
FADEC < 3:0 >
29, 30
31, 33
I TFB2022A DPU Futurebus+ address decode:
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
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
5