LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 425

• Manufacturer Part Number: LPC1837FET256,551
• Description: Microcontrollers (MCU) 32BIT ARM CORTEX-M3 MCU 136KB SRAM
• Manufacturer: NXP Semiconductors
• Series: LPC18xxr

Specifications of LPC1837FET256,551

• Core: ARM Cortex M3
• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 150MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, SD/MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• Lead Free Status / Rohs Status: Details
• Other names: 935293795551

NXP Semiconductors
<Document ID>
User manual
20.10.9.1 Isochronous pipe synchronization
a fulfillment condition. The transaction error bit set in the status field indicates a fulfillment
error condition. When a fulfillment error occurs, the frame after the transfer failed to
complete wholly, the device controller will force retire the ISO-dTD and move to the next
ISO-dTD.
It is important to note that fulfillment errors are only caused due to partially completed
packets. If no activity occurs to a primed ISO-dTD, the transaction will stay primed
indefinitely. This means it is up to software discard transmit ISO-dTDs that pile up from a
failure of the host to move the data. Finally, the last difference with ISO packets is in the
data level error handling. When a CRC error occurs on a received packet, the packet is
not retried similar to bulk and control endpoints. Instead, the CRC is noted by setting the
Transaction Error bit and the data is stored as usual for the application software to sort
out.
TX packet retired
Remark: For TX-ISO, MULT Counter can be loaded with a lesser value in the dTD
Multiplier Override field. If the Multiplier Override is zero, the MULT Counter is initialized to
the Multiplier in the QH.
RX packet retired
Remark: For ISO, when a dTD is retired, the next dTD is primed for the next frame. For
continuous (micro) frame to (micro) frame operation the DCD should ensure that the dTD
linked-list is out ahead of the device controller by at least two (micro) frames.
frame number (FRINDEX register) can be used as a marker. To cause a packet transfer to
occur at a specific (micro) frame number [N], the DCD should interrupt on SOF during
frame N-1. When the FRINDEX=N–1, the DCD must write the prime bit. The device
controller will prime the isochronous endpoint in (micro) frame N–1 so that the device
controller will execute delivery during (micro) frame N.
When it is necessary to synchronize an isochronous data pipe to the host, the (micro)
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MULT counter reaches zero.
Fulfillment Error [Transaction Error bit is set].
# Packets Occurred > 0 AND # Packets Occurred < MULT.
MULT counter reaches zero.
Non-MDATA Data PID is received.
Remark: Exit criteria only valid in hardware version 2.3 or later. Previous to hardware
version 2.3, any PID sequence that did not match the MULT field exactly would be
flagged as a transaction error due to PID mismatch or fulfillment error.
Overflow Error:
– Packet received is > maximum packet length. [Buffer Error bit is set].
– Packet received exceeds total bytes allocated in dTD. [Buffer Error bit is set].
Fulfillment error [Transaction Error bit is set]:
CRC Error [Transaction Error bit is set]
# Packets Occurred > 0 AND # Packets Occurred < MULT.
All information provided in this document is subject to legal disclaimers.
Rev. 00.13 — 20 July 2011
Chapter 20: LPC18xx USB0 Host/Device/OTG controller
UM10430
© NXP B.V. 2011. All rights reserved.
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