AT91SAM7X128 Atmel, AT91SAM7X128 Datasheet - Page 456
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AT91SAM7X128
Manufacturer Part Number
AT91SAM7X128
Description
MCU 32-Bit 91S ARM7TDMI RISC 128KB Flash 1.8V/3.3V 100-Pin LQFP
Manufacturer
Atmel
Datasheet
1.AT91SAM7X512-AU-999.pdf
(687 pages)
Specifications of AT91SAM7X128
Package
100LQFP
Device Core
ARM7TDMI
Family Name
91S
Maximum Speed
55 MHz
Ram Size
32 KB
Program Memory Size
128 KB
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Program Memory Type
Flash
Number Of Programmable I/os
62
Interface Type
CAN/Ethernet/SPI/I2S/TWI/USART/USB
On-chip Adc
8-chx10-bit
Operating Temperature
-40 to 85 °C
Number Of Timers
3
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Figure 34-6. Data IN Transfer for Non Ping-pong Endpoint
456
USB Bus Packets
TXPKTRDY Flag
(UDP_CSRx)
TXCOMP Flag
(UDP_CSRx)
FIFO (DPR)
Content
Using Endpoints With Ping-pong Attribute
AT91SAM7X512/256/128 Preliminary
Set by the firmware
Data IN
PID
Prevous Data IN TX
Data IN 1
Interrupt Pending
The use of an endpoint with ping-pong attributes is necessary during isochronous transfer. This
also allows handling the maximum bandwidth defined in the USB specification during bulk trans-
fer. To be able to guarantee a constant or the maximum bandwidth, the microcontroller must
prepare the next data payload to be sent while the current one is being sent by the USB device.
Thus two banks of memory are used. While one is available for the microcontroller, the other
one is locked by the USB device.
Figure 34-7. Bank Swapping Data IN Transfer for Ping-pong Endpoints
Cleared by Hw
Data IN 1
Microcontroller
1 st Data Payload
2 nd Data Payload
3 rd Data Payload
DPR access by the firmware
ACK
PID
Load In Progress
Set by the firmware
Microcontroller Load Data in FIFO
Data IN
PID
Bank 0
Endpoint 1
Bank 1
Endpoint 1
Bank 0
Endpoint 1
Write
NAK
PID
Cleared by Firmware
USB Device
Data IN
PID
DPR access by the hardware
Bank 0
Endpoint 1
Bank 1
Endpoint 1
Bank 0
Endpoint 1
Read
Read and Write at the Same Time
Data is Sent on USB Bus
Data IN 2
Payload in FIFO
Data IN 2
USB Bus
Cleared by Hw
2 nd Data Payload
3 rd Data Payload
1 st Data Payload
Data IN Packet
Data IN Packet
Data IN Packet
6120H–ATARM–17-Feb-09
ACK
PID
Cleared by
Firmware
Interrupt
Pending
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