YMF744B ETC [List of Unclassifed Manufacturers], YMF744B Datasheet - Page 40

• Manufacturer Part Number: YMF744B
• Description: DS-1S
• Manufacturer: ETC [List of Unclassifed Manufacturers]

YMF744B
F0h: Scan In/ Out Control
2-2-3. SB Suspend / Resume
b0................SBPDR: Sound Blaster Power Down Request
b1................SE: Scan Enable
b2................SM: Scan Mode
b3................SS: Scan Select
b7................SBPDA: Sound Blaster Power Down Acknowledgement
SBPDA
The SB block can read the internal state as to support Suspend and Resume functions. The internal state
is made up of 268 flip flops. To read the state, these states are shifted in order and read 8 bits at a time
from the SCAN DATA register.
These registers are mapped to the SB Mixer space (see SB Mixer Register map). The registers have the
following functions.
This bit stops the internal state of the Sound Blaster block.
This bit Shifts the internal state by 1 bit. Setting a “1” followed by a “0” shifts the internal state.
This bit sets whether to read or write the state.
This bit gives permission to read or write the internal data to the SCAN DATA register.
This bit indicates that the SB Block is ready to read or write to the internal state after setting SBPDR.
This bit is read only.
b7
“0”: Normal
“1”: Stop
“0”: Write
“1”: Read
“0”: Normal operation (Do not allow read or write).
“1”: Allow read and write.
“0”: Read/Write not possible
“1”: Read/ Write possible
Read / Write
Default: 00h
b6
-
b5
-
b4
(default)
(default)
-
SS
b3
SM
b2
-40-
SE
b1
SBPDR
b0
(default)
February 3, 1999