SCF5250 datasheet(3/56 Pages) FREESCALE

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SCF5250 Data Sheet: Technical Data, Rev. 1.3

Freescale Semiconductor

1.2.2

DMA Controller

The SCF5250 provides four fully programmable DMA channels for quick data transfer. Single and dual

address mode is supported with the ability to program bursting and cycle stealing. Data transfer is

selectable as 8, 16, 32, or 128-bits. Packing and unpacking is supported.

Two internal audio channels and the dual UART can be used with the DMA channels. All channels can

perform memory to memory transfers. The DMA controller has a user-selectable, 24- or 16-bit counter and

a programmable DMA exception handler.

External requests are not supported.

1.2.3

Enhanced Multiply and Accumulate Module (EMAC)

The integrated EMAC unit provides a common set of DSP operations and enhances the integer multiply

instructions in the ColdFire architecture. The EMAC provides functionality in three related areas:

1. Faster signed and unsigned integer multiplies

2. New multiply-accumulate operations supporting signed and unsigned operands

3. New miscellaneous register operations

Multiplies of 16x16 and 32x32 with 48-bit accumulates are supported in addition to a full set of extensions

for signed and unsigned integers plus signed, fixed-point fractional input operands. The EMAC has a

single-clock issue for 32x32-bit multiplication instructions and implements a four-stage execution

pipeline.

1.2.4

Instruction Cache

The instruction cache improves system performance by providing cached instructions to the execution unit

in a single clock. The SCF5250 processor uses a 8K-byte, direct-mapped instruction cache to achieve 107

MIPS at 120 MHz. The cache is accessed by physical addresses, where each 16-byte line consists of an

address tag and a valid bit. The instruction cache also includes a bursting interface for 16-bit and 8-bit port

sizes to quickly fill cache lines.

1.2.5

Internal 128-KByte SRAM

The 128-KByte on-chip SRAM is available in two banks, SRAM0 (64K) and SRAM1 (64K). It provides

one clock-cycle access for the ColdFire core. This SRAM can store processor stack and critical code or

data segments to maximize performance. Memory in SRAM1 can be accessed under DMA.

1.2.6

SDRAM Controller

The SCF5250 SDRAM controller provides a glueless interface for one bank of SDRAM up to 32 MB

(256 Mbits). The controller supports a 16-bit data bus. A unique addressing scheme allows for increases

in system memory size without rerouting address lines and rewiring boards. The controller operates in

page mode, non-page mode, and burst-page mode and supports SDRAMS.

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