LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 411

• 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
20.9.2.1 Determining the number of packets for Isochronous IN endpoints
Table 345. dTD token
Table 346. dTD buffer page pointer list
The following examples show how the MULT field in the dQH and the MultO in the dTD
are used to control the number of packets sent in an In-transaction for an isochronous
endpoint:
Example 1
MULT = 3; Max_packet_size = 8; Total_bytes = 15; MultO = 0 (default)
Access
RO
R/W
Access
RO
Bit
31:12
page 0:
11:0
page 1:
10:0
Bit
11:10
9:8
7:0
All information provided in this document is subject to legal disclaimers.
Name
MultO
-
Status
Name
BUFF_P
CURR_OFFS
FRAME_N
…continued
Rev. 00.13 — 20 July 2011
Chapter 20: LPC18xx USB0 Host/Device/OTG controller
Description
Multiplier Override (see
This field can be used for transmit ISOs to override the MULT
field in the dQH. This field must be zero for all packet types
that are not transmit-ISO.
00 - Execute N transactions as demonstrated by the USB
variable length protocol where N is computed using
Max_packet_length and the Total_bytes field in the dTD.
01 - Execute one transaction
10 - Execute two transactions
11 - Execute three transactions
Remark: Non-ISO and Non-TX endpoints must set
MultO=”00”.
reserved
Status
This field is used by the device controller to communicate
individual execution states back to the software. This field
contains the status of the last transaction performed on this
dTD.
Bit 7 = 1 - status: Active
Bit 6 = 1 - status: Halted
Bit 5 = 1 - status: Buffer Error
Bit 4 - reserved
Bit 3 = 1 - status: Transaction Error
Bit 2 - reserved
Bit 1 - reserved
Bit 0 - reserved
Description
Selects the page offset in memory for the packet buffer.
Non-virtual memory systems will typically set the buffer
pointers to a series of incrementing integers.
Offset into the 4 kB buffer where the packet is to begin.
Written by the device controller to indicate the frame
number in which a packet finishes. This is typically
used to correlate relative completion times of packets
on an isochronous endpoint.
Section 20.9.2.1
UM10430
for an example)
© NXP B.V. 2011. All rights reserved.
411 of 1164