HD6417712BPV Renesas Electronics America, HD6417712BPV Datasheet - Page 820
HD6417712BPV
Manufacturer Part Number
HD6417712BPV
Description
MPU 1.5/3.3V 0K PB-FREE 256-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH Ethernetr
Datasheet
1.HD6417712BPV.pdf
(980 pages)
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
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
HD6417712BPV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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Section 19 Ethernet Controller Direct Memory Access Controller (E-DMAC)
19.4
19.4.1
[Problems]
While the Ethernet functions are being used, the TR bit in EDTRR or the RR bit in EDRRR is
cleared to 0 to stop the E-DAMC functions if the descriptor valid bit is invalid. When the request
bit (TR or RR) is cleared by the E-DMAC and the request bit (TR or RR) is set by the user's
firmware simultaneously, transmission or reception may not be started even if the request bit (TR
or RR) is set to 1.
[Occurring Condition]
When the user's firmware tries to set the request bit (TR or RR), while the request bit (TR or RR)
is 1.
[Avoiding Methods]
To prevent the simultaneous occurrence of the request bit (TR or RR) being cleared by the E-
DMAC and the request bit (TR or RR) being set by the user's firmware, the user's firmware should
set the request bit (TR or RR) after confirming that it is cleared by the E-DMAC.
The methods to clear the RR bit with E-DMAC are as follows.
(1)
As a direct method, it is possible to confirm by reading the TR bit in EDTRR as 0.
As an indirect method, it is possible to confirm by reading the TDE bit in EESR as 1.
(2)
As a direct method, it is possible to confirm by reading the RR bit in EDRRR as 0.
As an indirect method, it is possible to confirm by reading the RDE bit in EESR as 0.
Rev. 1.00 Dec. 27, 2005 Page 776 of 932
REJ09B0269-0100
Confirmation of the TR bit
Confirmation of the RR bit
Usage Notes
Using of EDTRR and EDRRR
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