VI SDRAM CONTROLLER BLOCK: SDRAM INTERFACE

CEFUNC1–CEFUNC0: #CE pin function selection (D[A:9]) / DRAM timing set-up register (0x48130)

Select an area for connection with an SDRAM.

Table 2.14 #CE Output Assignment

Pin

CEFUNC = "00"

CEFUNC = "01"

CEFUNC = "1x"

#CE7/#SDCE0

#CE7/#SDCE0

#CE13/#SDCE0

#CE13/#SDCE0

#CE8/#SDCE1

#CE8/#SDCE1

#CE14/#SDCE1

#CE14/#SDCE1

 

 

(Default: CEFUNC = "00")

Set CEFUNC = "00" to use areas 7/8 for SDRAMs or CEFUNC = "01" to use areas 13/14 for SDRAMs. At cold start, CEFUNC is set to "00". At hot start, CEFUNC retains its status before being initialized.

A14IO: Areas 14–13 internal/external access selection (DD) / Access control register (0x48132)

A8IO: Areas 8–7 internal/external access selection (DA) / Access control register (0x48132)

A6IO: Area 6 internal/external access selection (D9) / Access control register (0x48132)

Select either internal access or external access for each area.

Write "1": Internal access

Write "0": External access

Read: Valid

Before the SDRAM controller can be used, A6IO must be set to "1" (internal access). Also, set A8IO to "1" to use areas 7/8 for SDRAMs or set A14IO to "1" to use areas 13/14 for SDRAMs.

At cold start, these bits are set to "0" (external access). At hot start, these bits retain their status before being initialized.

A6EC: Area 6 little/big endian method selection (D1) / Access control register (0x48132)

Select either little endian or big endian method for accessing each area.

Write "1": Big endian

Write "0": Little endian

Read: Valid

Set this register bit in the same way as set by LCDCEC (D0/0x39FFFD).

At cold start, this bit is set to "0" (little endian). At hot start, this bit retains its status before being initialized.

SDRAR1: Area 8/14 configuration (D6) / SDRAM area configuration register (0x39FFC0)

SDRAR0: Area 7/13 configuration (D7) / SDRAM area configuration register (0x39FFC0)

Set the area to be used for an SDRAM.

Write "1": For SDRAM

Write "0": For other devices

Read: Valid

SDRAMs can be connected to areas 7/8 or to areas 13/14. Write "1" to SDRAR0 to set area 7 or 13 for SDRAM use. Similarly, write "1" to SDRAR1 to set area 8 or 14 for SDRAM use. Writing a "0" to either bit sets the corresponding area to be used for devices other than an SDRAM.

At cold start, these bits are set to "0" (For a device not SDRAM). At hot start, these bits retain their status before being initialized.

B-VI-2-26

EPSON

S1C33L03 FUNCTION PART