Motorola MSC8101 ADS User's Guide Page 92

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4-16 MSC8101 User’s Guide
Connecting External Memories and Memory-Mapped Devices
Figure 4-11. Single-Master MSC8101 Bus to HDI16 Interface
See Figure 4-12 for an example of a PowerPC system bus operating in Multi-Master
mode interconnected to a buffered HDI16 interface. For a few DSPs, the MSC8101 data
bus can connect directly to the DSP host port without any glue logic. However, because
many applications deal with a multi-DSP concept, appropriate buffering must be added to
meet the capacitive loading requirements and make the solution more scalable to a larger
bank of DSP devices. The same UPM programming can be used for both buffered and
unbuffered systems. The MSC8101 Buffer Control lines (
BCTL[0–1]) control the direction
and output enable of the 74LCX245 bidirectional buffer. To enable the buffer control
lines, SIUMCR[BC1PC]=00; for an active low output enable, SIUMCR[BCTLC]=00 (or
01). Again, the
BCTL[0–1] lines are used so that the same PowerPC system bus-to-HDI16
interconnect can also be controlled via a GPCM machine.
MSC8101
MSC8101
MSC8101
DSP2
DSP1
Single-Master
UPM
MSC8101 Bus
IRQx
CS3
CS5
CS4
GPL2
BS0
IRQy
HREQ
HCS1
HCS2
HRD
HWR
HA[0–3]
HD[0–15]
HDI16
HDI16
HREQ
HCS1
HCS2
HRD
HWR
HA[0–3]
HD[0–15]
A[27–30]
D[0–15]
PowerPC System Bus
HDDS = VCC for Dual Data Strobe mode
HDSP = GND for active low data strobes
HCSP = GND for active low chip selects
H8BIT = GND for 16-bit mode
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