UPD70F3786GJ-GAE-AX Renesas Electronics America, UPD70F3786GJ-GAE-AX Datasheet - Page 1507

• Manufacturer Part Number: UPD70F3786GJ-GAE-AX
• Description: MCU 32BIT V850ES/JX3-E 144-LQFP
• Manufacturer: Renesas Electronics America
• Series: V850ES/Jx3-Er

Specifications of UPD70F3786GJ-GAE-AX

• Core Processor: RISC
• Core Size: 32-Bit
• Speed: 50MHz
• Connectivity: CAN, CSI, EBI/EMI, Ethernet, I²C, UART/USART, USB
• Peripherals: DMA, LVD, PWM, WDT
• Number Of I /o: 100
• Program Memory Size: 512KB (512K x 8)
• Program Memory Type: FLASH
• Ram Size: 124K x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 3.6 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

23.6.2 Descriptor mechanism
stores transmit data and receive data is not contiguous. The Ethernet controller uses the following three types of
descriptors.
Configuration of Descriptor Chain (During Packet Reception)).
Descriptor chain).
chain to RXDP or the first address of a transmit descriptor chain to TXDP, and setting the RXS or TXS bit of the
ETHMODE register.
The Ethernet controller supports a descriptor mechanism to support a situation where the memory space that
• Buffer descriptor
• Link pointer
• End of chain
Each descriptor expands data aligned with 2 words (64 bits) on memory (refer to Figure 23-29 Example of
The Ethernet controller can consecutively process two or more descriptors in one DMA transfer (refer to 23.6.2 (6)
Reception DMA transfer or transmission DMA transfer is started by setting the first address of a receive descriptor
A descriptor chain must end with the descriptor of an end of chain.
(1) Format of buffer descriptor
A buffer descriptor is configured of 2 words (64 bits). The lower word consists of control bits. The higher word
indicates the start address value of the data buffer indicated by the descriptor.
T(0) E
31
63
30 29 28 27 26
U
D
S
Figure 23-19. Buffer Descriptor Format
CHAPTER 23 ETHERNET CONTROLLER
O
25
User’s Manual U19601EJ2V0UD
Status
Buffer Address Pointer
16 15
Size
32
0
1505