STLC1510 datasheet(15/40 Pages) STMICROELECTRONICS

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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:

A Bit Unpack unit, extracting a variable length

bit string from the frame RAM

A Constellation Encoder, converting the bits to

a constellation point

Pseudo -random sequence generators PRBS,

& MAPPRG.

5.4.3 Demapper Description

The demapper consists of:

A Constellation Decoder, converting the input

constellation point to bits.

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):

Advanced System Bus (ASB)

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

D950

DPCO MM

ASB

Brid ge /

LA MBA BUS

Int

Tmr

Ctrl

Pm em

Ym em

Xm em

Int

Tmr

Cntl

Mem

B oot

ROM

Dec

EMU

TAP

EM U

TAP

APB

X BUS

Y BUS

P BUS

Off Chip

Arb iter/

De c od e

ASB can ex tend to the APB,

X Bus , Y Bus, P Bus and

LAM BA Bus .

X Bus can extend to LAMB A

Bus.

EPM

APB

B ridg e

Dec

HPI

I/F

CORE

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