Motorola DSP56301 - Manual (Page 136)

Host Port Pins
6 -18 DSP56301 User’s Manual
6.6 Host Port Pins
The HI32 signals are discussed in Chapter 2. In this section, Table 6-8 summarizes the pin
functionality in the different HI32 operating modes. Examples of host-to-HI32 connections
are given in Figure 6-2, Figure 6-3, and Figure 6-4.
Table 6-8. Host Port Pin Functionality
HI32
Port
Pin
PCI Bus
Mode
Universal Bus Mode 1
GPIO
Mode Enhanced Universal
Bus Mode
Universal Bus Mode
DCTR[HM] = $1 DCTR[HM] = $3 DCTR[HM] = $2 DCTR[HM] = $4
HP[7–0] HAD[15–0] HA[10–3] HIO[7–0]
HP[15–8] HD[7–0] HIO[15–8]
HP[19–16] HC[3–0]/HBE[3–0] HA[2–0] HIO[18–16]
UNUSED
1 HIO19
HP20 HTRDY HDBEN HIO20
HP21 HIRDY HDBDR HIO21
HP22 HDEVSEL HSAK HIO22
HP23 HLOCK
HBS
1 HIO23
HP24 HPAR
HDAK
3 disconnected
HP25 HPERR HDRQ
HP26 HGNT HAEN
HP27 HREQ HTA
HP28 HSERR HIRQ
HP29 HSTOP HWR/HRW
HP30 HIDSEL HRD/HDS
HP31 HFRAME
UNUSED
2
HP32 HCLK UNUSED 4
HP[40–33] HAD[23–16] HD[15–8] disconnected
HP[48–41] HAD[31–24] HD[23–16]
Output is high impedance if HCTR[HRF]
≠
$0.
Input is disconnected if HCTR[HTF]
≠
$0.
HP49 HRST HRST
HP50 HINTA
NOTES: 1. When the host bus is less than 24 bits wide, the data pins that are not used for transferring
data must be forced or pulled to Vcc or to GND.
2. Must be forced or pulled to Vcc or GND.
3. HBS/HDAK should be forced or pulled up to Vcc if not used.
4. Must be forced or pulled up to Vcc.