DSP56362AD datasheet(91/168 Pages) MOTOROLA

91 / 168 page

Specifications

Parallel Host Interface (HDI08) Timing

MOTOROLA

DSP56362 Advance Information

2-53

342

Delay from DMA HACK deassertion to HOREQ

assertion

• For “Last Data Register” read5

× TC + 19.1 39.1 —

• For “Last Data Register” write5

1.5

× TC + 19.1 34.1 —

• For other cases

0.0

—

343

Delay from DMA HACK assertion to HOREQ

deassertion

•HROD = 05

——

20.2

344

Delay from DMA HACK assertion to HOREQ

deassertion for “Last Data Register” read or

write

• HROD = 1, open drain Host Request5, 11

——

300.

Notes:

See Host Port Usage Considerations in the DSP56362 User Design Manual.

In the timing diagrams below, the controls pins are drawn as active low. The pin

polarity is programmable.

VCC = 3.3 V ± 0.16 V; TJ = 0°C to +100°C, CL = 50 pF

The read data strobe is HRD in the dual data strobe mode and HDS in the single

data strobe mode.

The “last data register” is the register at address $7, which is the last location to be

read or written in data transfers. This is RXL/TXL in the little endian mode (HBE = 0),

or RXH/TXH in the big endian mode (HBE = 1).

This timing is applicable only if a read from the “last data register” is followed by a

read from the RXL, RXM, or RXH registers without first polling RXDF or HREQ bits,

or waiting for the assertion of the HOREQ signal.

This timing is applicable only if two consecutive reads from one of these registers

are executed.

The write data strobe is HWR in the dual data strobe mode and HDS in the single

data strobe mode.

The data strobe is host read (HRD) or host write (HWR) in the dual data strobe

mode and host data strobe (HDS) in the single data strobe mode.

10. The host request is HOREQ in the single host request mode and HRRQ and HTRQ

in the double host request mode.

11. In this calculation, the host request signal is pulled up by a 4.7 k

Ω resistor in the

open-drain mode.

Table 2-20 Host Interface (HDI08) Timing1, 2 (Continued)

No.

Characteristics3

Expression

100 MHz

Unit

Min Max

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

DSP56362AD Datasheet(PDF) 91 Page - Motorola, Inc

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