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Programming Reference
HOST
15
8
7
*0 *0
Host Base Address Register (HBAR)
X:$FFFFC5
Reset = $80
Host Request Open Drain
HDRQ
HROD
HREN/HEW
1
0
0
1
1
0
1
0
1
1
1
1
BA9
5
4
3
2
1
0
BA8
BA7
BA6
BA5
BA4
BA3
Host GPIO Port Enable
0 = GPIO Pins Disable, 1 = GPIO Pin Enable
Host Address Line 8 Enable
0 Æ HA8 = GPIO, 1 Æ HA8 = HA8
Host Address Line 9 Enable
0 Æ HA9 = GPIO, 1 Æ HA9 = HA9
Host Data Strobe Polarity
0 = Strobe Active Low, 1 = Strobe Active High
Host Chip Select Enable
0 Æ HCS/HAI0 = GPIO,
1 Æ HCS/HA10 = HC8, if HMUX = 0
1 Æ HCS/HA10 = HC10, if HMUX = 1
Host Address Strobe Polarity
0 = Strobe Active Low, 1 = Strobe Active High
Host Multiplexed Bus
0 = Nonmultiplexed, 1 = Multiplexed
Host Request Enable
0 Æ HREQ/HACK = GPIO,
1 Æ HREQ = HREQ, if HDRQ = 0
Host Dual Data Strobe
0 = Single Strobe, 1 = Dual Strobe
Host Chip Select Polarity
0 = HCS Active Low
HTRQ & HRRQ Enable
1 = HCS Active High
HDRQ
0
0
1
1
6
BA10
Host Acknowledge Enable
0 Æ HACK = GPIO
If HDRQ & HREN = 1,
HACK = HACK
Host Request Polarity
HRP
0
HREQ Active Low
1
HREQ Active High
0
HTRQ,HRRQ Active Low
1
HTRQ,HRRQ Active High
Host Enable
0 Æ HI08 Disable
Pins = GPIO
1 Æ HI08 Enable
Host Acknowledge Polarity
0 = HACK Active Low, 1 = HACK Active High
15
Host Port Control
Register (HPCR)
X:$FFFFC4
Read/Write
Reset = $0
HAP
14
13
12
HRP
HCSP
HDDS HMUX HASP
11
10
9
8
7
6
5
HDSP
HROD
*0
HEN
HAEN
4
3
2
1
0
HREN HCSEN HA9EN HA8EN HGEN
= Reserved, Program as 0
*
Figure E-7 Host Base Address and Host Port Control Registers
MOTOROLA
DSP56307 User’s Manual
E-23