SAF82526 INFINEON [Infineon Technologies AG], SAF82526 Datasheet - Page 120
SAF82526
Manufacturer Part Number
SAF82526
Description
Data Communications ICs
Manufacturer
INFINEON [Infineon Technologies AG]
Datasheet
1.SAF82526.pdf
(126 pages)
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Upgrades of HSCX Version V2.1
3
The bits VN3 … VN0 of the Version Status Register (VSTR) contain the value 5 for version
V2.1. All HSCX version numbers are listed below:
VN3 … 0
0: 000
2: 010
4: 100
5: 101
4
No more timing restrictions exist for HSCX V2.1 when the CPU accesses the RNR-bit of the
Command Register (CMDR).
5
In multipoint configurations using the HDLC normal response mode (NRM) the P-bit of the
control field carries out the polling function. The primary station normally polls the other
secondary stations by transmitting either RR frames with P = 1 or I-frames with P = 1. I-frames
with P = 0 may be used by the primary station to transmit data to an individual secondary
station without requesting data from this station at the same time. In this case the secondary
station will receive and acknowledge this I-frame, but will not react by transmitting any data to
the primary station.
In the following it is assumed that the secondary station is waiting for transmission.
A secondary station using an HSCX VA3 in NRM auto-mode will transmit data to the primary
station after it has received an I-frame with of P = 0 or = 1.
The new HSCX V2.1 handles the P-Bit of I-frames according to ISO 4335. It will transmit data
to the primary station after it has received an I-frame with P = 1, but not after an I-frame has
been received with P = 0.
6
The new HSCX V2.1 supports back-to-back frame transmission in all clock modes without any
problem, including the strobe modes (clock mode 1 and 5).
7
The INT output signal of the HSCX V2.1 does not change its value during a write access to the
HSCX (CS x WR for Intel and DS x WR for Motorola).
Semiconductor Group
Version ID
RNR Flow Control in Auto-Mode
I-Frames with P = 0 in NRM Auto-Mode
Transmission of Back-to-Back Frames
INT Output Signal
VA1
VA2
VA3
Version
V2.1
120
SAB 82525
SAB 82526
SAF 82525
SAF 82526
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