CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
148
4.8 Management Interface
The management interface provides an interface with the microprocessor that controls
µ
PD98413. The
microprocessor can access the internal registers of the
µ
PD98413 via the management interface.
The
µ
PD98413 supports 32-bit multiplexed synchronous bus for connecting a microprocessor. These buses are
general-purpose bus interfaces that require fewer external circuitries connecting the microprocessor bus.
Signal I/O
Description
MCLK
I
Microprocessor bus Clock
AD31-0
I/O
Address / data bus
CS_B
I
I/O chip select signal
UWE_B
I
Upper word enable signal
R/W_B
I
Read / write select signal
RDY_B O
Ready
signal
INT_B O
Interrupt
Signal
4.8.1 Endian
The microprocessor bus is set to little endian as the default condition after reset. To connect a microprocessor with
a big endian interface, set the MIFM bit of the MDDGEN register to “1”.
The
µ
PD98413 controls access by using AD1 (address) and UWE_B as follows. To UWE_B, a negative logic high-
order word valid signal or a negative logic 4-byte valid signal can be connected.
(a) Little endian (MIFM=”0”)
Address Data
AD1
UWE_B
AD [31:16]
AD [15:0]
0
0
Bit [31:16]
Bit [15:0]
0 1
Invalid
Bit
[15:0]
1 0
Bit
[31:16]
Invalid
1 1
Bit
[31:16]
Invalid
(b) Big endian (MIFM=”1”)
Address Data
AD1
UWE_B
AD [31:16]
AD [15:0]
0
0
Bit [31:16]
Bit [15:0]
0 1
Bit
[31:16]
Invalid
1 0
Invalid
Bit
[15:0]
1 1
Invalid
Bit
[15:0]
Содержание NEASCOT-P65
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