Product specifications

VT8237R Data Sheet
Revision 2.06 December 15, 2004 -18- Pin Descriptions
Internal Keyboard Controller and Speaker Pin Descriptions
Internal Keyboard Controller
Signal Name Pin # I/O PU Signal Description
MSCK
W1 IO PU Mouse Clock. From internal mouse controller. Dev17 Fun0
Rx51[2]=1.
MSDT
W2 IO PU Mouse Data. From internal mouse controller.
Dev17 Fun 0 Rx51[2]=1.
KBCK / KA20G W3 IO PU MultiFunction Pin (Internal keyboard controller enabled by Dev17
Fun 0 Rx51[0])
Rx51[0]=1 Keyboard Clock. From internal keyboard controller
Rx51[0]=0 Gate A20. Input from external keyboard controller.
KBDT / KBRC V1 IO PU MultiFunction Pin (Internal keyboard controller enabled by Dev 17
Fun 0 Rx51[0])
Rx51[0]=1 Keyboard Data. From internal keyboard controller.
Rx51[0]=0 Keyboard Reset. From external keyboard controller
(KBC) for CPURST# generation
Note: KBCK, KBDT, MSCK, and MSDT are powered by the VSUS33 suspend voltage plane.
Speaker
Signal Name Pin # I/O PU Signal Description
SPKR / strap AF8 O Speaker. Strap low to enable (high to disable) CPU frequency
strapping.