mt90503 Zarlink Semiconductor, mt90503 Datasheet - Page 55

• Manufacturer Part Number: mt90503
• Description: 2048vc Aal1 Sar
• Manufacturer: Zarlink Semiconductor

Figure 21 TDM Circular Buffer (Complete Buffer in T1 mode, Strict Multiframing) shows a T1 circular buffer in
standard multiframing mode. The T1 circular buffer is identical to an E1 circular buffer except that the multiframes
are 24 bytes instead of 16 bytes.
tx_sar_read_pnt
tdm_write_pnt
(earliest)
tdm_cas_write_p
nt (earliest)
tdm_write_pnt
(latest)
tdm_cas_write_pnt
(latest)
Figure 21 - TDM Circular Buffer (Complete Buffer in T1 mode, Strict Multiframing)
23 byte offset
n=Buffer word size {128,256,512,1024}
+(n*2)-40
+(n*2)-20
+20
+40
+60
+80
+0
b 15
b14
TX MultiFrame (n/32)-2
TX MultiFrame (n/32)-1
Reserved
TX MultiFrame 0
TX MultiFrame 1
TX MultiFrame 2
TX MultiFrame 3
TX MultiFrame 4
b13
High byte
b12
b11
Zarlink Semiconductor Inc.
b10
MT90503
b9
55
b8
b7
b6
RX MultiFrame (n/32)-2
RX MultiFrame (n/32)-1
RX MultiFrame 3
RX MultiFrame 0
RX MultiFrame 1
RX MultiFrame 2
RX MultiFrame 4
b5
Valid rx_sar_write_pnt Positions
Valid tx_sar_read_pnt Positions
Low byte
b4
b3
b2
b1
b0
tdm _cas_read_pnt
tdm _read_pnt
rx_sar_write_pnt
1 MF offset
MINIMUM
2 MF offset
Data Sheet