AN2269 Freescale Semiconductor / Motorola, AN2269 Datasheet - Page 6

• Manufacturer Part Number: AN2269
• Description: Interconnecting MPC8260 and MSC8101 ADS Boards Using DMA Transfers Across a 60x Bus
• Manufacturer: Freescale Semiconductor / Motorola

System Bus–HDI16 Host Interface
2.4 Host DMA Transfers
6
1
Manual but as CS6 in the MSC8101 Reference Manual.
C1, C3, C6,
This signal is designated as BTOLSC1 in the MSC8101ADS User’s
D[16–D32]
Pin No.
D[6, 13]
D[1–3]
B[1–3]
P16
D10
D12
C13
C31, C32
Pin No.
D31
D32
P4
Host MPC8260 Side
Notable features of the connections depicted in Table 1 are as follows:
• One chip select,
• Two separate General-Purpose Strobe Lines (
• Data Lines. The host MPC8260 device’s 60x-compatible bus data lines (
• DMA Request/Service Request Lines. Two separate DMA Request lines (IDMAx:
• Address Lines. The Address lines between the host MPC8260 and the HDI16 MSC8101 connect to
• Ground Lines. To provide the best ground plane while connecting the two ADS boards, it is highly
To prevent the host MPC8260 device from dedicating large amounts of 603e core resource to polling and
accessing the HDI16 MSC8101 device continually, the HDI16 peripheral can assert service request
interrupts to the host as needed. Two HDI16 request generation modes are available, namely single or
double request modes. In Single Request mode, one signal (
Signal Name
MPC8260 to the HDI16 MSC8101 HDI16 port and is connected to the HDI16 chip-select line (
—
—
the HDI16 data lines (
the Service Request signals (
enable burst transfers across the HDI16. The connections are defined as follows:
— 60x
— 60x
— 60x
— 60x
recommended that all grounds be common and connected together.
EXPGPL3
EXPGPL5
System + CPM Edge Connector
IDMA2
IDMA1
PGPL3
read access and low for write access.
PGPL5
16-bit read or write transaction.
0V
EXPA25
EXPA26
EXPA29
EXPA30
Table 1. ADS Physical Interconnects (Continued)
Freescale Semiconductor, Inc.
is programmed to generate the HDI16 read/write line (
is programmed to generate the HDI16 Data strobe (
For More Information On This Product,
CS6
DREQ–IDMA Request 2
DREQ–IDMA Request 1
→
→
→
→
Signal Description
UPM GPL Line 3
UPM GPL Line 5
HA0
HA1
HA2
HA3
(or
HDx
Go to: www.freescale.com
Ground
(PC1)
(PC0)
BTOLCS1
).
HRRQ
as it is called here), is used to map memory accesses from the host
and
HTRQ
GPLx
20, 35, 36
P4 = H0
Pin No.
) on the HDI16.
1, 2, 19,
27
28
29
30
) are used in this interface:
HREQ
Signal Name
HRRQ/HACK
HTRQ/HREQ
HRW
HDS
HDI16 MSC8101 Side
HDS
0V
) is used to request service for both
HRW
), which must be asserted every
HDI16 Connector
) which is typically high for a
EXPDx
Transmit Host Request OP
Receive Host Request OP
Signal Description
Host Data Strobe
) directly connect to
Host Read/Write
DREQ
Ground
) connect to
HCS
).