Freescale Semiconductor MPC5553 - Overview

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor 12-3
12.1.2 Overview
The EBI includes a memory controller that generates interface signals to support a variety of external
memories. This includes single data rate (SDR) burst mode flash, external SRAM, and asynchronous
memories. It supports up to four regions (via chip selects), each with its own programmed attributes.
12.1.3 Features
Features include the following:
• 1.8-3.3 V I/O
• 32-bit internal address bus with transfer size indication, but
— 24 bits available as external pins in the MPC5554 and in the MPC5553 416 and 324 BGA
packages
— 20 bits available in the MPC5553 416 and 324 BGA packages
— No external bus in the MPC5553 208 BGA package
— Table 12-1 shows the address bus packages supported.
• The external bus interface and the calibration bus interface share ADDR[12:26]. Refer to
Table 12-1.
• 32-bit data bus available for both external memory accesses and transactions involving an external
master, but
— 32 bits available in the MPC5554 and in the MPC5553 416 BGA package
Table 12-1. Address Bus Sizes in MPC5554 and MPC5553
MPC5553 MPC5554
416 324 208 416
EBI Address
Bus Size
24 bit
1
1
24 bits available: ADDR[12:31] is the default pin set, then ADDR[8:11] is added to
make the 24 bits. ADDR[8:11] can be used, or CS[0:3] / ADDR[8:11] can be
configured by PCR to be ADDR[8:11]. Only one set of ADDR[8:11] must be used for
address input, however.
20 bit
2
2
20 bits is default EBI size for the 416 package (ADDR[12:31]).
24 bit
3
3
24 bits available: ADDR[12:31] is the default pin set, then CS[0:3] must be configured
to be ADDR[8:11] in order to have 24 bits.
20 bit
4
4
20 bits is default EBI size for the 324 package (ADDR[12:31])
None 24 bit
5
5
24 bits available: ADDR[8:31] is typical, or CS[0:3] can be configured to be
ADDR[8:11]. Only one set of ADDR[8:11] must be used for address input, however.
Calibration
Address Bus
Size
19 or 21 bits
6
6
The calibration bus interface (CBI) and the external bus interface (EBI) share the
same bus. To use a 21-bit calibration bus, the CBI uses EBI signals ADDR[12:26] and
CAL_ADDR[10:11], and ADDR[8:11] must be configured in the PCR to use
CAL_ADDR[27:30]. When the calibration bus is 19 bits, ADDR[12:26] and
CAL_ADDR[27:30] are used (by configuring ADDR[8:11] in the PCR). Set the PA
field in the SIU_PCR register to 0b1 to use the calibration bus interface or the EBI.
19 or 21 bits
6
None N.A.