 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CS4237B Datasheet(PDF) 74 Page - Cirrus Logic |
|
|
|||||||||||||||||||||||||||||
CS4237B Datasheet(HTML) 74 Page - Cirrus Logic |
|
|
74 / 114 page  volume is applied to the PCM FM data, it is summed into the digital mixer which is then summed into the analog output mixer. For backwards compatibility with analog-mixed external FM devices, I18 and I19 in the WSS logical device can be remapped to control the volume of internal FM. Remapping is controlled through the FMRM bit in X4 register. When IFM = 1, and FMRM = 1, writes to I18 and I19 are remapped to X6 and X7 respectively. When remapping is enabled, the LINE analog input volume is controlled through X0/1. When FMRM = 0, internal FM volume is only control- led through X6/7. The synthesizer interface is compatible with the Adlib and Sound Blaster standards. The typical Adlib I/O address is SYNbase = 388h. Standard Adlib Synthesizer I/O Map Address Name Type SYNbase+0 FM Status Read Only SYNbase+0 FM Address 0 Write Only SYNbase+1 FM Data 0 Write Only SYNbase+2 FM Address 1 Write Only SYNbase+3 FM Data 1 Read Only EXTERNAL PERIPHERAL PORT An external peripheral port is provided for inter- facing devices external to the part. These may include the CS9233 Wavetable synthesizer, CDROM interface, modem interface, and Plug and Play E 2PROM. The External Peripheral Port consists of the fol- lowing signals: 8-bit data bus, 2 or 3 address lines, read strobe, write strobe, and reset signal. External Synthesizer Interface This part contains an internal FM synthesis en- gine. For backwards compatibility the default is to use an external FM-type synthesizer chip such as the Yamaha OPL3LS, or the Crystal Semicon- ductor CS9233 wave-table synthesizer chip. This interface consists of: SCS - chip select SINT - Synthesizer Interrupt The other signals such as address bits, data strobes, data, and reset are provided by the Ex- ternal Peripheral Port. The interface allows the host computer to access up to eight I/O mapped locations. When using an external FM synthe- sizer, SCS will respond to the SYNbase decode addresses as well as the SBPro mapped FM syn- t h esi zer add resse s. T he PnP syn the si zer alignment must be a multiple of 8. The polarity of SINT is programmable via Hard- ware Configuration data, IHS in byte 7, or through CTRLbase+1. The default is active low (IHS = 0). Since the typical FM interface only requires four I/O address and does not use an interrupt, the XA2 address and the SINT pins are multifunc- tion pins that default to XCTL0 and XCTL1. To use XCTL0/XA2 as an address pin, the hardware resource data must be changed. See the Hard- ware Configuration Data section for more information. To use XCTL1/SINT/ACDCS/ DOWN as an interrupt for the synthesizer, VCEN (in the Hardware Configuration data) must be zero, a pulldown resistor must be placed on the XIOW pin. Since XCTL1 and SINT are rarely used the pin has a third multiplexed func- tion, ACDCS, which is desc ribe d in the CDROM section below. The fourth multiplexed function is the hardware volume control pin DOWN which is controlled through the VCEN bit. See the Volume Control Interface section for more details. Note that ACDCS takes precedence over XCTL1/SINT. Also DOWN, when VCEN is set, takes precedence over all other functions. DS213PP4 CS4237B 74 |
Similar Part No. - CS4237B |
|
Similar Description - CS4237B |
|
|
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
