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參數(shù)資料
| 型號： | ST20GP6 |
| 英文描述： | MAX 7000 CPLD 256 MC 208-RQFP |
| 中文描述： | GPS處理器 |
| 文件頁數(shù)： | 45/116頁 |
| 文件大?。?/td> | 1107K |
| 代理商： | ST20GP6 |
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ST20-GP1
45/116
7
Memory map
The ST20-GP1 processor memory has a 32-bit signed address range. Words are addressed by
30-bit word addresses and a 2-bit byte-selector identifies the bytes in the word. Memory is divided
into 4 banks which can each have different memory characteristics and can be used for different
purposes. In addition, on-chip peripherals can be accessed via the device access instructions (see
Table 6.19).
Various memory locations at the bottom and top of memory are reserved for special system
purposes. There is also a default allocation of memory banks to different uses.
Note that the ST20-GP1 uses 30 bits of addressing internally, but addresses A20-A29 are not
brought out to external pins. Address bits A30 and A31 are used as bank selects.
7.1
System memory use
The ST20-GP1 has a signed address space where the address ranges from
MinInt
(#80000000)
at the bottom to
MaxInt
(#7FFFFFFF) at the top. The ST20-GP1 has an area of 4 Kbytes of RAM at
the bottom of the address space provided by on chip memory. The bottom of this area is used to
store various items of system state. These addresses should not be accessed directly but via the
appropriate instructions.
Near the bottom of the address space there is a special address
MemStart
. Memory above this
address is for use by user programs while addresses below it are for private use by the processor
and used for subsystem channels and trap handlers. The address of
MemStart
can be obtained
via the ldmemstartval instruction.
7.1.1
Each DMA channel between the processor and a subsystem is allocated a word of storage below
MemStart
. This is used by the processor to store information about the state of the channel. This
information should not normally be examined directly, although debugging kernels may need to do
so.
Boot channel
The subsystem channel which is a link input channel is identified as a ‘boot channel’. When the
processor is reset, and is set to boot from link, it waits for boot commands on this channel.
Subsystem channels memory
7.1.2
The area of memory reserved for trap handlers is broken down hierarchically. Full details on trap
handlers is given in see Section 4.6 on page 23.
Trap handlers memory
Each high/low process priority has a set of trap handlers.
Each set of trap handlers has a handler for each of the four trap groups (refer to Section
4.6.1).
Each trap group handler has a trap handler structure and a trapped process structure.
Each of the structures contains four words, as detailed in Section 4.6.3.
The contents of these addresses can be accessed via ldtraph sttraph ldtrappedand sttrapped
instructions.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST20-GP6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6CT33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
| ST20GP6CX33S | 功能描述:射頻無線雜項 GPS Processor RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| ST20GP6CX33STR | 功能描述:射頻無線雜項 GPS Processor RoHS:否 制造商:Texas Instruments 工作頻率:112 kHz to 205 kHz 電源電壓-最大:3.6 V 電源電壓-最小:3 V 電源電流:8 mA 最大功率耗散: 工作溫度范圍:- 40 C to + 110 C 封裝 / 箱體:VQFN-48 封裝:Reel |
| ST20GP6X33S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:GPS PROCESSOR |
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