DS2406 Ver la hoja de datos (PDF) - Dallas Semiconductor -> Maxim Integrated
Número de pieza
componentes Descripción
Fabricante
DS2406 Datasheet PDF : 30 Pages
| |||
DS2406
MEMORY MAP
The DS2406 has two memory sections, called data memory and status memory. The data memory
consists of 1024 bits of one-time programmable EPROM organized as 4 pages of 32 bytes each. The
address range of the device’s status memory is 8 bytes. The first seven bytes of status memory (addresses
0 to 6) are implemented as EPROM. The eighth byte (address 7) consists of static RAM. The complete
memory map is shown in Figure 5. The 8-bit scratchpad is an additional register that acts as a buffer when
writing the memory. Data is first written to the scratchpad and then verified by reading a 16-bit CRC
from the DS2406 that confirms proper receipt of the data and address. This process ensures data integrity
when programming the memory. If the buffer contents are correct, the bus master should transmit a
programming pulse (EPROM) or a dummy byte FFh (RAM) to transfer the data from the scratchpad to
the addressed memory location. The details for reading and programming the DS2406 are given in the
Memory Function Commands section.
DS2406 MEMORY MAP Figure 5
1K-Bit
EPROM
Page #
0
1
2
3
8-Bit Scratchpad
Address Range
0000h to 001Fh
0020h to 003Fh
0040h to 005Fh
0060h to 007Fh
Description
32-Byte final storage Data Memory
32-Byte final storage Data Memory
32-Byte final storage Data Memory
32-Byte final storage Data Memory
8 Bytes
Status
Memory
Valid Device
Settings 00
(SRAM)
Factory Redirection Bitmap of
Test Byte Bytes Used Pages
Write-Protect
Bits Data
Memory
DS2406 STATUS MEMORY MAP Figure 6
ADDRESS BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2
0 (EPROM) BM3
BM2 BM1 BM0 WP3
WP2
1 (EPROM)
1
1
1
1
1
1
2 (EPROM)
1
1
1
1
1
1
3 (EPROM)
1
1
1
1
1
1
4 (EPROM)
1
1
1
1
1
1
5 (EPROM)
EPROM Factory Test byte
6 (EPROM)
Don’t care, always reads 00
7 (SRAM) Supply PIO-B PIO-A CSS4 CSS3 CSS2
Indication Channel Channel Channel Channel Source
(read only) Flip-flop Flip-flop Select Select Select
BIT 1
WP1
Redir. 0
Redir. 1
Redir 2
Redir 3
BIT 0
WP0
Redir. 0
Redir. 1
Redir 2
Redir 3
CSS1
Source
Select
CSS0
Polarity
5 of 30
Share Link: 