HD6417712BPV Renesas Electronics America, HD6417712BPV Datasheet - Page 261

• Manufacturer Part Number: HD6417712BPV
• Description: MPU 1.5/3.3V 0K PB-FREE 256-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH Ethernetr

Specifications of HD6417712BPV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, Ethernet, FIFO, SCI, SIO
• Peripherals: DMA, POR, WDT
• Number Of I /o: 24
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

6.2
The cache has the following registers. For details on register addresses and register states during
each process, refer to section 23, List of Registers.
• Cache control register 1 (CCR1)
• Cache control register 2 (CCR2)
• Cache control register 3 (CCR3)
6.2.1
The cache is enabled or disabled using the CE bit in CCR1. CCR1 also has a CF bit (which
invalidates all cache entries), and WT and CB bits (which select either write-through mode or
write-back mode). Programs that change the contents of the CCR1 register should be placed in
address space that is not cached.
Bit
31 to 4
3
2
1
Register Descriptions
Cache Control Register 1 (CCR1)
Bit Name
—
CF
CB
WT
Initial
Value
All 0
0
0
0
R/W
R
R/W
R/W
R/W
Description
Reserved
These bits are always read as 0. The write value
should always be 0.
Cache Flush
Writing 1 flushes all cache entries (clears the V, U,
and LRU bits of all cache entries to 0). This bit is
always read as 0. Write-back to external memory is
not performed when the cache is flushed.
Write-Back
Indicates the cache’s operating mode for space P1.
0: Write-through mode
1: Write-back mode
Write-Through
Indicates the cache’s operating mode for spaces P0,
U0, and P3.
0: Write-back mode
1: Write-through mode
Rev. 1.00 Dec. 27, 2005 Page 217 of 932
REJ09B0269-0100
Section 6 Cache