
TM1300 Data Book
Philips Semiconductors
17-10
PRODUCT SPECIFICATION
VSS
Valid Slot Size (Bit 11-8). The VSS[3:0] bits control the valid slot size (starting from slot 1) for different modem analog
front end devices. The valid setup value ranges from 1 to 16 slot(s). The value 16 is accomplished by storing a ‘0’ in
this eld.
FMS
Frame Sync Mode Select (Bit 7). The FMS bit value should only be changed when the transmitter and receiver are
disabled. FMS selects the type of frame sync to be recognized by both Rx and Tx. When FMS = ‘1’, frame sync is
word-length bit clock. When this bit = ‘0’, frame sync is a 1-bit clock.
FSP
Frame Sync Polarity (Bit 6). The FSP bit value should only be changed when the transmitter and receiver are dis-
abled. FSP controls which edge of frame sync is the active edge for both Rx and Tx. This bit causes frame signal to
be active at rising edge when FSP = ‘0’ , or falling edge when FSP = ‘1’.
MOD
Mode Select (Bit 5). The MOD bit value should only be changed when the transmitter and receiver are disabled. MOD
selects the operational mode of the SSI for ISDN functionality. When MOD is set, the SSI is congured as a U-inter-
face for ISDN NT. Otherwise, set to ‘0’. Setting MOD bit and CD2 supports the MC145574 and MC145572 ISDN in-
terface transceivers.
EMS
Endian Mode Select (Bit 4). Selects the big- or little-endian mode operation. See Section 17.8 for more detail.
ILS
Interrupt Level Select (Bit 3-0). Sets the point where an interrupt is generated for normal data buffer servicing. The
number ranges from 1 to 15. This eld controls interrupt level of both transmit and receive functions.
Table 17-5. SSI control register (SSI_CTL) elds.
Field
Description
Table 17-6. IO1 mode select
Bit
Mode
00
General Purpose Output: Congures the SSI_IO1 pin for general purpose output. The pin follows the state of the WIO1
eld of the SSI_CTL.
01
General Purpose Input: Change detector may be used. Value can be read in from the RIO1 eld of the SSI_CSR.
10
Enable External TxCLK: Allows for use of an externally generated TxCLK. The clock is provided via the TxCLK pin. All
general purpose I/O functions are unavailable.
11
Disable: Pin is not used. Output buffer is tristated and the input is ignored. (RESET default)
Table 17-7. IO2 mode select
Bit
Mode
00
General Purpose Output: Congures the SSI_IO2 pin as a general purpose output. The pin follows the state of the WIO2
eld of the SSI_CTL.
01
General Purpose Input: Value can be read in from RIO2 eld of the SSI_CSR.
10
Frame Signal TxFSX (Output): Outputs the frame signal generated by the internal frame signal generation logic.
11
Frame Signal TxFSX (Input): Allows for use of an externally generated TxFSX. The frame sync signal is provided via
TxFSX pin. All general purpose I/O functions are unavailable. (RESET default)