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參數(shù)資料
| 型號： | STLC1510 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | NorthenLite G.lite DMT Transceiver |
| 中文描述： | NorthenLite G.lite大唐收發(fā)器 |
| 文件頁數(shù)： | 15/40頁 |
| 文件大?。?/td> | 426K |
| 代理商： | STLC1510 |
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STLC1510
5.4.2 Mapper Description
The mapper realizes the bit extraction and constella-
tion encoding functions specified in G.922.2 (§ 7.8.1
and § 7.8.2 respectively); it is mainly intended to ac-
celerate the main CPU in these bit manipulation op-
erations.
The mapper consists of:
I
A Bit Unpack unit, extracting a variable length
bit string from the frame RAM
I
A Constellation Encoder, converting the bits to
a constellation point
I
Pseudo -random sequence generators PRBS,
& MAPPRG.
5.4.3 Demapper Description
The demapper consists of:
I
A Constellation Decoder, converting the input
constellation point to bits.
I
A Bit Pack unit, inserting the variable length bit
string into the frame RAM.
5.5 Embedded Processor Core - Functional
Description
The Embedded Processor Core consists of two pro-
grammable cores; the ARM7TDMI 32-bit micropro-
cessor and the D950 16-bit DSP, their associated
peripherals/memory, a DPCOMM (Dual-Port Com-
munications) for messaging, and a Bridge/Arbiter/
Decode (BAD) block. A block diagram of the EPM is
shown below.
There are two buses locally used by the ARM7 core
which are collectively known as the Advanced Micro-
controller Bus Architecture (AMBA):
I
Advanced System Bus (ASB)
I
Advanced Peripheral Bus (APB) connected to
the ASB via an APB Bridge
The LAMBA Bus, a subset of the AMBA bus specifi-
cation, connects all the blocks in the data pump por-
tion of the STLC1510.
Figure 4. EPM and LAMBA Bus Block Diagram
ARM7
CORE
D950
CORE
DPCO MM
ASB
Bridge/
Arbiter/
Decode
LAMBA BUS
Int
Ctrl
Tmr
Pmem
Ymem
Xmem
Int
Cntl
Tmr
Mem
Boot
ROM
Dec
EMU
TAP
EMU
TAP
APB
X BUS
Y BUS
P BUS
Off Chip
ASB can extend to the APB,
X Bus, Y Bus, P Bus and
LAMBA Bus.
X Bus can extend to LAMBA
Bus.
EPM
APB
Bridge
Dec
Dec
HPI
I/F
16
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