PCD5096 datasheet(24/52 Pages) PHILIPS

24 / 52 page

1997 Jan 22

Philips Semiconductors

Preliminary speciﬁcation

Universal codec

PCD5096

9.5

IOM control table

The selection of active slots in the IOM-2 interface and the logic connection between an IOM slot and an IOM data buffer

is defined in the IOM control table located at addresses 20H to 3FH of the SDR. The IOM control table is ‘n’ words long.

The number ‘n’ is the number of slots resulting from the IOM mode selection in Control Register 1. Speech slot 0 is

defined by word 0 (address 20H) in the IOM control table, and speech slot ‘n’ by word ‘n’ (address 20H + n). The IOM

interface block reads all words in the IOM control table once every speech frame (125

µs). In every IOM slot in a speech

frame the IOM-2 interface block reads the corresponding word in the IOM control table. The function of the bits within

each word is shown in Table 30. Depending on the IOM mode selected, only part of the IOM control table address space

is used. The unused space is free for extra IOM data buffers or for other applications.

Table 30 Word deﬁnition in the IOM control table

Table 31 IOM data buffers location in SDR

BIT

FUNCTION

B15 to B10

not used

Mute. If B9 = 1, data on the DO output is forced to zero regardless of the contents of the IOM data

buffer. The input data on DI is not affected. If B9 = 0, then normal operation is selected.

Local. If B8 = 1, swap in/out buffers. If B8 = 0, then normal operation is selected. See Section 9.7.

Select byte. When byte transfer is selected (B6 = 1); B7 = 1, selects the high byte and B7 = 0 selects

the low byte.

Byte/word transfer. If B6 = 1, then byte transfer is selected. If B6 = 0, then word transfer is selected

and two consecutive slots are activated.

Active slot. If B5 = 1, the slot is active. If B5 = 0, the slot is idle.

B4 to B0

IOM data buffer assigned to the slot. These 4 bits select the locations in SDR where the IOM data

buffer will reside. The allowed values are 10000 to 11101; see Table 31.

IOM BUFFER CODE

ADDRESS IN SDR (HEX)

40 to 43

44 to 47

48 to 4B

4C to 4F

50 to 53

54 to 57

58 to 5B

5C to 5F

60 to 63

64 to 67

68 to 6B

6C to 6F

70 to 73

74 to 77

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