WYJ6 card
The WYJ6 is a BUSMAT card that combines up to 9 MiB battery-backed paged Random Access Memory (RAM), watchdog and some general purpose digital inputs and outputs. The card provides both new interface compatible with ARBus 0.0 providing PCI-compatible configuration, and legacy interface for full compatibility with original WYJ5 cards.
The RAM controller is compatible with RAMBAT 0.0 interface. The memory is accessed using 32 KiB pages. The page content is accessible by Paged RAM Access Window (BAR1). The visible page can be selected by Rambat Page register. The last page in Legacy Mode is accessible also by separate Non-paged RAM Access Window (BAR2).
The RAM memory parameters are autoconfigured. The page size is equal to Base Address Region 1 size. The number of pages can be detected by writing maximal value to Rambat Page register and read it back as maximal supported page.
Ordering guide
| Order Code | Bus Interface | Form factor | Page Size [KiB] | Total Memory [MiB] |
| WYJ6-5M | BUSMAT | BUSMAT | 32 | 5 |
| WYJ6-9M | BUSMAT | BUSMAT | 32 | 9 |
AR-2c compatibility
All current AR-2c dataloggers use WYJ6 card in legacy mode and it introduces some limitations. Additionally older programs does not support 32 KiB pages. So using WYJ6 card in AR-2c datalogger have following limitations:
- only 256 pages are visible to AR-2c. In case of 9 MiB card only 8 MiB is used for AR-2c storage.
- on old programs only 16 KiB of 32 KiB page is used. In case of 9MiB card only 4 MiB is used for AR-2c storage.