External Bus Interface (EBI)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
12-11
12.2.1.13 Transfer Size 0 through 1 (TSIZ[0:1])
TSIZ[0:1] indicates the size of the requested data transfer. Because the MPC5565 does not have transfer
size pins (TSIZ[0:1]), use the SIZEN and SIZE fields in the EBI_MCR to indicate the transfer size for
MCU-to-MCU transfers.
12.2.1.14
Calibration Chip Selects (CAL_CS[0] and CAL_CS[2:3])
CAL_CS[
n
] is asserted by the master to indicate that this transaction is targeted for a particular memory
bank on the calibration external bus.
The calibration chip selects are driven only by the EBI. External master accesses on the calibration bus are
not supported. In all other aspects, the calibration chip selects behave exactly as the primary chip selects.
Refer to
Section 12.4.1.5, “Memory Controller with Support for Various Memory Types
chip select operation.
12.2.1.15 Calibration Signals
Calibration signals are only available on the VertiCal assembly for this device. The calibration signal
functions are explained in
Chapter 2, “Signal Description
DATA is not driven by the EBI during a calibration bus access. During a calibration bus access, the
non-calibration bus signals (other than DATA) are held in a negated state, with the exception of RD_WR
and ADDR, which reflect the same values shown on the calibration version of those signals. Because the
TS and CS signals are held negated on the EBI (non-calibration bus) during calibration accesses, no
transfer occurs on the EBI.
During a EBI bus access, the calibration bus signals (other than CAL_DATA) are held in a negated state.
CAL_DATA is not driven during non-calibration accesses.
12.2.2
Signal Function and Direction by Mode
The EBI operating mode is configured using two fields in the EBI Master Control register (EBI_MCR):
EXTM and MDIS. Their settings determine which EBI signals are valid and the I/O direction. When the
a signal is configured for non-EBI function in the EBI_MCR, the EBI always negates the signal if the EBI
controls the corresponding pad (determined by SIU configuration).
lists the function and
direction of the external signals in each of the EBI modes of operation. The clock signals are not included
because they are output only (from the FMPLL module) and are not affected by EBI modes. Refer to
Section 12.3.1.3, “EBI Module Configuration Register (EBI_MCR)
” for details on the EXTM and MDIS
bits.
Содержание MPC5565
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