MMC2107 Datasheet, PDF (513/618 Pages) –

Freescale Semiconductor, Inc.
External Bus Interface Module (EBI)
Bus Master Cycles
19.7.2 Write Cycles
On a write cycle, the EBI transfers data to an external memory or
peripheral device. See Figure 19-2.
MMC2107
ADDRESS DEVICE
1. DRIVE ADDRESS ON A[22:0].
2. DRIVE TSIZ[1:0] PINS FOR OPERAND SIZE.
3. ASSERT CS IF USED.
4. CLEAR R/W TO WRITE.
5. ASSERT EB (ONE OR MORE DEPENDING ON DATA SIZE AND POSITION.
6. DRIVE DATA ON D[31:16] AND/OR D[15:0].
EXTERNAL PERIPHERAL
ACCEPT DATA
1. RECEIVE CS.
2. DECODE ADDRESS.
3. ASSERT TA IF NECESSARY FROM SLAVE DEVICE.
4. RECEIVE DATA FROM D[31:16] AND/OR D[15:0].
1. NEGATE EB.
TERMINATE OUTPUT TRANSFER
1. NEGATE TA.
TERMINATE CYCLE
START NEXT CYCLE
1. NEGATE CS IF USED.
2. REMOVE DATA FROM D[31:16] AND/OR D[15:0].
Figure 19-2. Write Cycle Flowchart
MMC2107 – Rev. 2.0
MOTOROLA
External Bus Interface Module (EBI)
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Technical Data
513