adsp-21469 Analog Devices, Inc., adsp-21469 Datasheet - Page 6

• Manufacturer Part Number: adsp-21469
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21469/ADSP-21469W
FIR Accelerators
The FIR (finite impulse response) accelerator consists of a 1024
word coefficient memory, a 1024 word deep delay line for the
data, and four MAC units. A controller manages the accelerator.
The FIR accelerator runs at the peripheral clock frequency.
IIR Accelerators
The IIR (infinite impulse response) accelerator consists of a
1440 word coefficient memory for storage of biquad coeffi-
cients, a data memory for storing the intermediate data and one
MAC unit. A controller manages the accelerator. The IIR accel-
erator runs at the peripheral clock frequency.
Table 3. ADSP-21469 Internal Memory Space
The ADSP-21469’s SRAM can be configured as a maximum of
160k words of 32-bit data, 320k words of 16-bit data, 106.7k
words of 48-bit instructions (or 40-bit data), or combinations of
different word sizes up to 5 megabit. All of the memory can be
accessed as 16-bit, 32-bit, 48-bit, or 64-bit words. A 16-bit float-
ing-point storage format is supported that effectively doubles
the amount of data that may be stored on-chip. Conversion
between the 32-bit floating-point and 16-bit floating-point for-
mats is performed in a single instruction. While each memory
block can store combinations of code and data, accesses are
most efficient when one block stores data using the DM bus for
transfers, and the other block stores instructions and data using
the PM bus for transfers.
Using the DM bus and PM buses, with one bus dedicated to a
memory block, assures single-cycle execution with two data
transfers. In this case, the instruction must be available in the
cache.
IOP Registers 0x0000 0000–0x0003 FFFF
Long Word (64 bits)
BLOCK 0 RAM
0x0004 9000–0x0004 EFFF
Reserved
0x0004 F000–0x0005 8FFF
BLOCK 1 RAM
0x0005 9000–0x0005 EFFF
Reserved
0x0005 F000–0x0005 FFFF
BLOCK 2 RAM
0x0006 0000–0x0006 3FFF
Reserved
0x0006 4000–0x0006 FFFF
BLOCK 3 RAM
0x0007 0000–0x0007 3FFF
Reserved
0x0007 4000–0x0007 FFFF
Extended Precision Normal or
Instruction Word (48 bits)
BLOCK 0 RAM
0x0008 C000-0x0009 3FFF
Reserved
0x0009 E000–0x000B 1FFF
BLOCK 1 RAM
0x000A C000-0x000B 3FFF
Reserved
0x000B E000–0x000B FFFF
BLOCK 2 RAM
0x000C 0000–0x000C 5554
Reserved
0x000C 8000–0x000D FFFF
BLOCK 3 RAM
0x000E 0000–0x000E 5554
Reserved
0x000E 8000–0x000F FFFF
Rev. PrB | Page 6 of 56 | November 2008
Normal Word (32 bits)
BLOCK 0 RAM
0x0009 2000-0x0009 DFFF
Reserved
0x0009 E000–0x000B 1FFF
BLOCK 1 RAM
0x000B 2000-0x000B DFFF
Reserved
0x000B E000–0x000B FFFF
BLOCK 2 RAM
0x000C 0000-0x000C 7FFF
Reserved
0x000C 8000–0x000D FFFF
BLOCK 3 RAM
0x000E 0000–0x000E 7FFF
Reserved
0x000E 8000–0x000F FFFF
MEMORY
The ADSP-21469 adds the following architectural features to
the SIMD SHARC family core.
On-Chip Memory
The ADSP-21469 contains 5 Mbits of internal RAM. Each block
can be configured for different combinations of code and data
storage (see
independent accesses by the core processor and I/O processor.
The ADSP-21469 memory architecture, in combination with its
separate on-chip buses, allow two data transfers from the core
and one from the I/O processor, in a single cycle.
The memory map in
address space of the ADSP-21469.
The 48-bit space section describes what this address range looks
like to an instruction that retrieves 48-bit memory.
The 32-bit section describes what this address range looks like
to an instruction that retrieves 32-bit memory.
EXTERNAL MEMORY
The external port on the ADSP-21469 SHARC provides a high
performance, glueless interface to a wide variety of industry-
standard memory devices. The external port may be used to
interface to synchronous and/or asynchronous memory devices
through the use of its separate internal memory controllers: the
16-bit DDR2 DRAM controller for connection of industry-stan-
dard synchronous DRAM devices, while the second is an 8-bit
asynchronous memory controller intended to interface to a
variety of memory devices. Four memory select pins enable up
Table
Preliminary Technical Data
3). Each memory block supports single-cycle,
Table 3
displays the internal memory
BLOCK 0 RAM
0x0012 4000–0x0013 BFFF
Reserved
0x0013 C000–0x0016 3FFF
BLOCK 1 RAM
0x0016 4000-0x0017 BFFF
Reserved
0x0017 C000–0x0017 FFFF
BLOCK 2 RAM
0x0018 0000–0x0018 FFFF
Reserved
0x0019 0000–0x001B FFFF
BLOCK 3 RAM
0x001C 0000–0x001C FFFF
Reserved
0x001D 0000–0x001F FFFF
Short Word (16 bits)