Digital recording system based on K9F6408U0A and SPDS202A

K9F6408U0A is a NAND-type 64 megabit flash memory produced by Samsung. It has the advantages of low working voltage, fast erasing speed and small size. SPDS202A's voice chip produced by Taiwan's Lingyang company. The article introduces the digital recording system with SPDS202A as the core, and introduces the specific method to realize the copy function between two K9F6408U0A. Finally, related hardware interfaces and software programs are given.

1 Introduction to K9F6408U0A

The biggest advantage of K9F6408U0A is that its command, data and address can communicate with the main controller through 8 I / O lines. This greatly simplifies the system wiring and enhances the stability of the system. In addition to 8 I / O lines, K9F6408U0A also includes the following control lines, so that the system main controller can easily control K9F6408U0A. They are:

CLE: Command latch enable terminal, high level effective. At the rising edge of the WE signal, the command signal can be locked into the command register through the I / O port.

ALE: address latch enable terminal, active high. At the rising edge of the WE signal, the address signal can be locked into the address register through the I / O port.

CE: Chip select line, active low. During a page program or block erase operation or when the device is busy, the CE high level will be ignored.

WE: Write enable port. Commands, addresses and data are locked at the rising edge of the WE signal.

RE: Read enable port, send data to the I / O line on the falling edge of the port, and increase the internal column address register by 1.

WP: Write protection port, low level effective. When it is low, program and erase operations are prohibited.

R / B: Operation status indication signal. When it is low, it indicates that the program, erase or read operation is in progress, and it becomes high after the operation is completed.

2 SPDS202A Introduction

SPDS202A is a very cost-effective voice chip produced by Taiwan SUNPLUS company. It can be easily interfaced with the host. The host can control the recording and playback functions of the voice chip by sending command codes. It has the following characteristics:

● Single-chip audio / voice coding / * chip, using SACM-S480 or SACM-S3200 compression and decompression algorithms. With a sampling rate of 8kHz, the low data rate is 4.8kbps or 32kbps;

● With digital volume control function;

● With FLASH management function, can automatically manage FLASH data internally, its standard FLASH interface can connect up to 4 FLASH, a total of 64Mbit.

● Using UART interface can easily interface with PC and other RS232 devices, and can easily upload or download data;

● Built-in PLL circuit;

● Embedded high-quality 10-bit 8kHz ADC and DAC;

● Low power consumption, using 2.8V ～ 3.6V working voltage.

Because SPDS202A has the above characteristics, only a small number of peripheral circuits can be added to form a large-capacity voice recording and playback system.

3 Composition of digital recording system

The structure of the digital recording system with SPDS202A as the core and Winbond ’s W78E58 as the main controller is shown in FIG. Byte SRAM is very suitable for the magnetic programming operation of K9F6408U0A.

Figure 2 shows the hardware interface circuit of W78E58 and SPDS202A. In the figure, TADCE is the chip select signal line, which can latch the command / data on its rising edge. TADSEL1 and TADSEL0 are command selection signal lines, and their functions are listed in Table 1.

Trolley Plastic Speaker: