 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
DP83905 Datasheet(PDF) 11 Page - National Semiconductor (TI) |
|
|
||||||||||||||||||||||||||||||
DP83905 Datasheet(HTML) 11 Page - National Semiconductor (TI) |
|
|
11 / 80 page  40 Functional Description (Continued) 16-BIT IO PORT COMPATIBLE MODE IO ADDRESS MAPPING This mode is compatible with Novell’s NE2000 The base IO address of the ATLANTIC Controller is configured by Configuration Register A (either upon power up or by soft- ware writing to this register) At that address the following structure appears Base a 00H DP8390 Core Registers Base a 0FH Base a 10H Data Transfer Port Base a 17H Base a 18H Reset Port Base a 1FH FIGURE 5 IO Port Mode Register IO Map The registers within this area are 8 bits wide but the data transfer port is 16 bits wide The ATLANTIC Controller’s registers can be programmed to control the passing of data between its internal memory and the data transfer port By accessing the data transfer port (using IO instructions) the user can transfer data to or from the ATLANTIC Control- ler’s internal memory The ATLANTIC Controller’s internal memory map is as shown in Figure 6 ATLANTIC Controller actually has a 64k address range but only does partial decoding on these devices The PROM data is mirrored at all decodes up to 4000H and the entire map is repeated at 8000H To access either the PROM or the RAM the user must initiate a Remote DMA transfer be- tween the IO port and memory On a remote read the ATLANTIC Controller moves data from its internal memory map to the IO port and the host system reads it by using an ‘‘INW’’ or ‘‘INSW’’ instruction from the IO address of the data transfer port If the system attempts to read the port before ATLANTIC Controller has written the next word of data to it ATLANTIC Controller will insert wait states into the system cycle using the CHRDY 0000H D15 D0 001FH PROM Aliased PROM 4000H 8kx16 Buffer RAM 7FFFH 8000H Aliased PROM C000H Aliased Buffer RAM FFFFH (a) D15 D0 1EH 00 57H 1CH 00 57H 00 RESERVED 0AH 00 E’net Address 5 08H 00 E’net Address 4 06H 00 E’net Address 3 04H 00 E’net Address 2 02H 00 E’net Address 1 00H 00 E’net Address 0 (b) FIGURE 6 a) NIC Core’s Memory Map b) 16-Bit Prom Map 11 |
Similar Part No. - DP83905 |
|
Similar Description - DP83905 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
