MMC2107 - Freescale Semiconductor

Chip Configuration Module (CCM)
Freescale Semiconductor, Inc.
Table 3-9. Chip Select CS0 Configuration Encoding
Chip Select CS0 Control
CSCR0
Register
CSCR1
Register
CSEN Bit PS Bit CSEN Bit
nc...
Freescale Semiconductor, I
NOTE:
Chip select disabled (32-bit port size) 0 1 1 (1)
Chip select enabled with 16-bit port size 1 0 0
Chip select enabled with 32-bit port size 1 1 0
1. CSCR1 CSEN is initially set only in emulation mode when booting from internal memory
and is cleared otherwise.
Once reset is exited, the states of the CSEN and PS bits in CSCR0 and
the CSEN bit in CSCR1 remain, but can be modified by software.
When booting externally, the D28 pin should be driven low during reset
configuration to disable the internal FLASH located at address 0x0 so
that no conflict exists with the external boot device.
The boot device selection during reset configuration is summarized in
Table 3-10.
Boot Device Selection
Internal boot device;
default 32-bit port
External boot device
with 16-bit port
External boot device
with 32-bit port
Table 3-10. Boot Device Selection (1)
CSCR0
Register
CSCR1
Register
CSEN Bit PS Bit CSEN Bit
D18 driven low D19 don’t care D18 driven low
D18 driven high D19 driven low D18 driven high
D18 driven high D19 driven high D18 driven high
1. Modifying the default configurations is possible only if the external RCON pin is asserted.
Technical Data MMC2107 – Rev. 2.0
104 Chip Configuration Module (CCM) MOTOROLA
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