MC68MH360EM25L Freescale Semiconductor, MC68MH360EM25L Datasheet - Page 379

• Manufacturer Part Number: MC68MH360EM25L
• Description: IC MPU QUICC ETHER 25MHZ 240FQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68MH360EM25L

• Processor Type: M683xx 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 240-FQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

7.6.5 IDMA Examples
The following paragraphs provide IDMA examples.
7.6.5.1 SINGLE BUFFER EXAMPLES. To see three examples of single buffer operation,
see the 7.6.4.6.1 Dual Address Mode.
7.6.5.2 BUFFER CHAINING EXAMPLE. •The following example shows the setup required
MOTOROLA
1. Initialize basic IDMA channel 1 registers:
2. ICCR = $0720. Recommended normal configuration.
3. FCR1 = $89. Source function code is 1000; destination function code is 1001.
4. SAPR1 not initialized. Will be initialized later by RISC controller.
5. DAPR1 not initialized. Will be initialized later by RISC controller.
6. BCR1 not initialized. Will be initialized later by RISC controller.
7. CSR1 = $FF. Clear any CSR bits that are currently set.
8. CMAR1 = $00. Disable interrupts for this example.
9. CMR1 = $530C. The RISC controls the IDMA activity (RCI bit is set). The IDMA
10. Issue the INIT_IDMA command to the RISC controller. This command is not required
11. CR = $0591. Issue INIT_IDMA command to IDMA channel 1.
12. Initialize the IDMA channel 1 parameter RAM:
13. IBASE = $0000. This points the beginning of the IDMA BDs. The value of $0000
14. Initialize the first IDMA BD:
15. BD1_STATUS = $0000. This is offset 0 from the BD. Set up all bits except the
16. BD1_Data_Length = $00000010. Transfer 16 bytes.
17. BD1_Source_Pointer = $00000000. Source address.
18. BD1_Destination_Pointer = $00001000. Destination address.
19. BD1_STATUS = $8000. Set the V-bit. It is good practice to set the V-bit last;
20. Initialize the second IDMA BD:
21. BD2_STATUS = $0000. This is offset 0 from the BD. Set up all bits except the
to initialize IDMA channel 1 to perform three buffer transfers using the buffer chaining
mode. This example will move 16 bytes from address 0 to address $1000, then 16 bytes
from address $100 to $1100, and then 16 bytes from address 200 to $1200.
channel uses 12.5% of the bus bandwidth. The source and destination size are
long word. Do not set the STR bit yet.
unless the IDMA was reset with the CMR RST bit while in the buffer chaining or auto
buffer modes.
means that the first IDMA BD is located at the beginning of the internal dual-port
RAM.
V-bit.
however, in this example the IDMA channel is not yet enabled, so it could have
been set earlier.
Freescale Semiconductor, Inc.
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MC68360 USER’S MANUAL
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IDMA Channels
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