HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 1061

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

22.4.2
Big and little endians are supported on the local bus, determined at power-on reset by the external
endian specification pin (MD5). Therefore, when transferring data between the local bus and the
PCI bus, when the local bus is set for big endian, big/little endian conversion is therefore required.
Figure 22.19 shows the block diagram of the local bus endian control. An endian conversion
circuit is provided between the local bus and the FIFO. For details of the endian control, refer to
section 22.4.3, Endian Control in DMA Transfers, and section 22.4.4, Endian Control in Target
Transfers (Memory Read/Memory Write).
22.4.3
Although only the longword access size is supported in DMA transfers (see table 22.11), the
endian conversion mode can be selected from the following four types depending on whether the
longword data consists of four byte data units or two word data units.
The conversion mode can be switched by the setting of bits 10 and 9 (ALNMD) of the DMA
control registers (PCIDCR0 to 3) for PCI.
1. Byte data boundary mode: Big/little endian conversion is performed on the assumption that all
2. Word/longword (W/LW) boundary mode 1: Longword data is transferred as byte data x 4.
3. Word/longword (W/LW) boundary mode 2: Longword data is transferred as word data x 2.
data is on a byte boundary. (ALNMD = b'00)
(ALNMD = b'01)
(ALNMD = b'10)
Big/little endian
Endian Control for Local Bus
Endian Control in DMA Transfers
Local bus
32 bits
32 bits
Figure 22.19 Endian Control for Local Bus
Big/little →
Little →
big/little
little
B, W, LW
LW
LW
LW
Rev.4.00 Oct. 10, 2008 Page 961 of 1122
Targer WT
Target RD
FIFO
FIFO
DMA
DMA
22. PCI Controller (PCIC)
32 bits
32 bits
Little endian
REJ09B0370-0400
PCI bus