参数资料
型号: MC68MH360VR25L
厂商: Freescale Semiconductor
文件页数: 128/158页
文件大小: 0K
描述: IC MPU QUICC 25MHZ 357-PBGA
标准包装: 44
系列: M683xx
处理器类型: M683xx 32-位
速度: 25MHz
电压: 5V
安装类型: 表面贴装
封装/外壳: 357-BBGA
供应商设备封装: 357-PBGA(25x25)
包装: 托盘
Chapter 5. Buffer Descriptors
Chapter 5
Buffer Descriptors
50
QMC buffer descriptors are located within 64 Kbytes in external memory; see Figure 2-2.
Each buffer descriptor contains key information about the buffer it denes.
The rst two sections describe the contents of the receive and transmit buffer descriptors
for the QMC protocol.
The third section discusses the placement of QMC and non-QMC buffer descriptors in
internal and external memory.
5.1 Receive Buffer Descriptor
Figure 5-1 shows a receive buffer descriptor.
Notes: For the 68360, the bit numbering is reversed. See Appendix A for more information.
Entries in boldface must be initialized by the user.
Figure 5-1. Receive Buffer Descriptor (RxBD)
Table 5-1 describes the individual elds of a receive buffer descriptor. Boldfaced entries
must be initialized by the user.
0123456789
10
11
12
13
14
15
OFFSET + 0
E
WI
LF
CM
UB
LG
NO
AB
CR
OFFSET + 2
DATA LENGTH
OFFSET + 4
Rx DATA BUFFER POINTER
OFFSET + 6
Table 5-1. Receive Buffer Descriptor (RxBD) Field Descriptions
Field
Name
Description
0
E
Empty
0 The data buffer associated with this buffer descriptor has been lled with received data, or
data reception has been aborted due to an error. The core is free to examine or write to any
eld of this RxBD. The CPM does not use this buffer descriptor again while the empty bit
remains zero.
1 The data buffer associated with this buffer descriptor is empty, or reception is currently in
progress. This RxBD and its associated receive buffer are owned by the CPM. If E = 1, the
CPU core should not write to any eld of this RxBD.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
..
.
相关PDF资料
PDF描述
MC68MH360CVR25L IC MPU QUICC 25MHZ 357-PBGA
HMC40DTEI CONN EDGECARD 80POS .100 EYELET
FMC50DRAS-S734 CONN EDGECARD 100PS .100 R/A SLD
EMC40DTEF CONN EDGECARD 80POS .100 EYELET
AMM22DREI CONN EDGECARD 44POS .156 EYELET
相关代理商/技术参数
参数描述
MC68MH360VR25LR2 功能描述:微处理器 - MPU QUICC 2SMC 1SPI RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68MH360VR25VL 功能描述:微处理器 - MPU QUICC 2SMC 1SPI RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68MH360VR33L 功能描述:微处理器 - MPU QUICC 2SMC 1SPI RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68MH360VR33LR2 功能描述:微处理器 - MPU QUICC 2SMC 1SPI RoHS:否 制造商:Atmel 处理器系列:SAMA5D31 核心:ARM Cortex A5 数据总线宽度:32 bit 最大时钟频率:536 MHz 程序存储器大小:32 KB 数据 RAM 大小:128 KB 接口类型:CAN, Ethernet, LIN, SPI,TWI, UART, USB 工作电源电压:1.8 V to 3.3 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:FBGA-324
MC68MH360ZP25L 功能描述:IC MPU 32BIT QUICC 357-PBGA RoHS:否 类别:集成电路 (IC) >> 嵌入式 - 微处理器 系列:M683xx 标准包装:2 系列:MPC8xx 处理器类型:32-位 MPC8xx PowerQUICC 特点:- 速度:133MHz 电压:3.3V 安装类型:表面贴装 封装/外壳:357-BBGA 供应商设备封装:357-PBGA(25x25) 包装:托盘