NSAM266SA datasheet(9/52 Pages) NSC

Part #	NSAM266SA

Description	NSAM266SA CompactSPEECHTM Digital Speech Processor with Serial Flash Interface

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Manufacturer	NSC [National Semiconductor (TI)]

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10 Hardware (Continued)

Consider

the

following

extensive

usage

of

all

the

NM29A040’s blocks

1 Record 15 minutes of messages (until the memory is full)

2 Playback 15 minutes (all the recorded messages)

3 Delete all messages

Assuming a NM29A040 device is used in this manner 24

times a day its expected lifetime is

Flash Lifetime e 100000(24

365) e 114 years

Thus the NM29A040 device will last for over ten years even

when used for six hours of recording per day

Note that if an NM29A080 device is used then under the

same conditions it will last for more than 20 years

ROM Interface

IVS vocabularies can be stored in either serial flash andor

ROM The CompactSPEECH supports IVS ROM devices

through Expansion Memory Up to 64 kbytes (64k x 8) of

Expansion Memory are supported directly Nevertheless

the CompactSPEECH uses bits of the on-chip port (PB) to

further extend the 64 kbytes address space up to

05 Mbytes address space

ROM is connected to the CompactSPEECH using the data

bus D(07) the address bus A(015) the extended address

signals EA(1618) and Expansion Memory Chip Select

EMCS controls The number of extended address pins to

use may vary depending on the size and configuration of

the ROM

Reading from Expansion Memory

An Expansion Memory read bus-cycle starts at T1 when the

data bus is in TRI-STATE

and the address is driven on the

address bus EMCS is asserted (cleared to 0) on a T2W1

cycle This cycle is followed by three T2W cycles and one

T2 cycle The CompactSPEECH samples data at the end of

the T2 cycle

The transaction is terminated at T3 when EMCS becomes

inactive (set to 1) The address remains valid until T3 is

complete A T3H cycle is added after the T3 cycle The

address remains valid until the end of T3H

136 Codec Interface

The CompactSPEECH provides an on-chip interface to a

serial codec This interface supports codec operation in

long- or short-frame formats The format is selected with the

CFG command

The codec interface uses four signalsCDIN CDOUT

CCLK and CFS0

Data is transferred to the codec through the CDOUT pin

Data is read from the codec through the CDIN pin

Data transfer between the CompactSPEECH and the serial

codec starts by the CompactSPEECH asserting (setting to

1) the CFS0 frame synchronization signal After one clock

cycle the CompactSPEECH de-asserts (clears to 0) CFS0

data from the CompactSPEECH is sent to the codec

through CDOUT and simultaneously data from the codec is

sent to the CompactSPEECH through CDIN

Short Frame Protocol

When short frame protocol is configured eight data bits are

exchanged with each codec in each frame ie CFS0 cycle

Data transfer starts when CFS0 is set to 1 for one CCLK

cycle

The data is then transmitted

bit-by-bit

via the

CDOUT output pin Concurrently the received data is shift-

ed in via the CDIN input pin Data is shifted one bit in each

CCLK cycle

Figure 1-6 shows how the codec interface signals behave

when short frame protocol is configured

Long Frame Protocol

When long frame protocol is configured eight data bits are

exhanged with each codec as with the short frame proto-

col However for the long frame protocol data transfer

starts by setting CFS0 to 1 for eight CCLK cycles Simulta-

neously the data for the first codec is shifted out bit-by-bit

via the CDOUT output pin as in short frame protocol Con-

currently the received data is shifted in through the CDIN

input The data is shifted one bit in each CCLK cycle

Figure 1-7 shows how the codec interface signals behave

when long frame protocol is configured

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