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pansion Connector is using for off-board tools (ECOM,DMA e.g.) it's necessary to avoid signal col-
lisions. For this purpose Host I/F buffers should be disabled for external non-dedicated tools. The
placement Host I/F signals is shown in the following table.
Con/Pin No.
Signal Name
P2/A24
HWRDS
P2/A23
HRDRW
P2/A22
HCS1
P2/A21
HCS2
P2/B31-B32
HD(14:15)
P2/C15-C28
HD(0:13)
P2/D21
HREQTRQ
P2/D24
HRRQACK
P2/D29-D32
HA(0:3)
P2/A30,C30
PDP
P1/C10
HRESETb
P1/B20
PORSTb
5•10
DMA off-board tool
The MSC8101 has multi-channel DMA connected to both PPC and Internal Local Bus. The DMA
supports flyby transfer between peripheral and memory when they have the same port size. For
testing flyby mode will be used off-board tool consists FIFO's array and control logic placing on the
wire-wrap prototype board. This tool allows to check DRACK (DMA Request Logic) and DONE
logic. The tool will be connected to CPM Expansion Connectors.
5•11
Board Control & Status Register - BCSR
Most of the hardware options on the ADS are controlled or monitored by the BCSR, which is a 32
bit wide read / write register file. BCSR resides over the PPC Bus, accessed via the MSC8101's
memory controller (see
fact includes 8 registers: BCSR0 to BCSR7. Since the minimum block size for a CS region is
32KBytes and only A(27:29) lines are decoded by the BCSR for register selection, BCSR0 -
BCSR7 are duplicated many times inside that region. See also
ifications" on page
12.
The following functions are controlled / monitored by the BCSR:
1)
PPC Data Bus width 64/32 bits.
2)
CODEC Enable/Disable.
3)
QFALC:
54
Freescale Semiconductor, Inc.
Functional Description
TABLE 5-8. Host I/F Interconnect signals
Shadow Signal
(For
MPC8260ADS)
PD8
PD9
PD10
PD11
PA(1:0)
PB(17:4)
PC11
PC8
PC(3:0)
GND
HRESET~
N.C.
TABLE 5-3. "MSC8101ADS Chip Select Assignments" on page
MSC8101ADS RevB User's Manual
For More Information On This Product,
Go to: www.freescale.com
Description
Data Strobe (HDS)/Write Strobe (HWR)
Read Write Select (HRW)/Read Strobe (HRD)
Host Chip Select
Global Host Chip Select
Host Data bits 14-15
Host Data bits 0-13
Host Request/Host Transmit Request
Host Receive Request/Host Acknowledge
Host Address bits 0-3.
Presence Detect Pins - should be pull-upped on the ADS. If
etx. tool has these pins grounded Host buffer will be
disabled
combinatorialy.
disconnected for Host I/F tool.
Hard Reset
Output of Host to asserts PORESET on the ADS to start
Host Configuration sequence.
TABLE 1-1. "MSC8101ADS Spec-
The
pins
must
remain
44) and in
MOTOROLA
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