Motorola DSP56303 User Manual page 147

Table 6-19. HI08 Programming Model, DSP Side (Continued)
Register
Bit
Bit
No.
8 HROD
HPCR
9 HDSP
10 HASP
11 HMUX
12 HDDS
13 HCSP
14 HRP
15 HAP
HSR 0 HRDF
1 HTDE
2 HCP
3 HF0
4 HF1
HBAR 7–0 BA[10–3] Host Base
HRX 23–0
HTX 23–0
HDR 16–0 D[16–0] GPIO signal Data
HDRR 16–0 DR[16–0] GPIO signal
Bit
Name Value
Host Request 0
Open Drain 1
Host Data Strobe 0
Polarity 1
Host Address 0
Strobe Polarity 1
Host Multiplexed 0
Bus 1
Host Dual Data 0
Strobe 1
Host Chip Select 0
Polarity 1
Host Request 0
Polarity 1
Host Acknowledge 0
Polarity 1
Host Receive Data 0
Full 1
Host Transmit 1
Data Empty 0
Host Command 0
Pending 1
Host Flag 0
Host Flag 1
Address Register
DSP Receive Data
Register
DSP Transmit
Data Register
0
Direction 1
Host Interface (HI08)
Programming Model Quick Reference
Function
HREQ/HTRQ/HRRQ = driven
HREQ/HTRQ/HRRQ = open drain
HDS/HRD/HWR active low
HDS/HRD/HWR active high
HAS active low
HAS active high
Separate address and data lines
Multiplexed address/data
Single Data Strobe (HDS)
Double Data Strobe (HWR, HRD)
HCS active low
HCS active high
HREQ/HTRQ/HRRQ active low
HREQ/HTRQ/HRRQ active high
HACK active low
HACK active high
no receive data to be read
Receive Data Register is full
The Transmit Data Register is
empty.
The Transmit Data Register is not
empty.
no host command pending
host command pending
Input
Output
Reset Type
HW/ Indivi-
STOP
SW dual
0
0 — —
0 — —
0 — —
0 — —
0 — —
0 — —
0 — —
0 0 0
1 1 1
0 0 0
0 — —
0 — —
$80
empty
empty
$0000 — —
$0000 — —
6-33