5.5. Elimination of floating bytes on the
external interface
The PrimeCell MPMC uses the programmed external memory width
of each bank and the endianness to determine which remaining bytes
it requires to drive to ensure that the external bus is never floating.
The input/output pads for the external write data bus lines are
controlled by nMPMCDATAOUTEN[3:0] as
shown in Table 5.32. Data
is driven out on MPMCDATAOUT[31:0] when nMPMCDATAOUTEN is asserted LOW.
Table 5.32. MPMCDATAOUT[31:0] controlled by nMPMCDATAOUTEN[3:0]
| nMPMCDATAOUTEN | MPMCDATAOUT |
|---|
| [3] | [31:24] |
| [2] | [23:16] |
| [1] | [15:8] |
| [0] | [7:0] |
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