S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 501

• Manufacturer Part Number: S1D13505
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

Epson Research and Development
Vancouver Design Center
3 S1D13505 Host Bus Interface
3.1 PowerPC Host Bus Interface Pin Mapping
Interfacing to the Motorola MPC821 Microprocessor
Issue Date: 01/02/05
Note
The S1D13505 implements a 16-bit native PowerPC host bus interface which is used to
interface to the MPC821 microprocessor.
The PowerPC host bus interface is selected by the S1D13505 on the rising edge of
RESET#. After releasing reset the bus interface signals assume their selected configuration.
For details on S1D13505 configuration, see Section 4.3, “S1D13505 Hardware Configu-
ration” on page 18.
The following table shows the functions of each host bus interface signal.
At reset, the Host Interface Disable bit in the Miscellaneous Disable Register
(REG[1Bh] bit 7) is set to 1. This means that only REG[1Ah] (read-only) and
REG[1Bh] are accessible until a write to REG[1Bh] sets bit 7 to 0 making all regis-
ters accessible. When debugging a new hardware design, this can sometimes give the
appearance that the interface is not working, so it is important to remember to clear this
bit before proceeding with debugging.
Table 3-1: PowerPC Host Bus Interface Pin Mapping
Pin Names
S1D13505
BUSCLK
RD/WR#
AB[20:0]
DB[15:0]
RESET#
WAIT#
WE1#
WE0#
M/R#
RD#
CS#
BS#
External Decode
External Decode
PowerPC
CLKOUT
RESET#
A[11:31]
RD/WR
D[0:15]
TSIZ1
TSIZ0
TS
TA
BI
X23A-G-008-05
S1D13505
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