User's Manual

9/29/2004 OV4F2
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User Manual BCM2035
04/23/03
Broadcom Corporation
Document 2035-UM100-R Load Mini-Drivers From UART Page 41
To ensure that all the different stages of the download procedure can be achieved with efficiency; many
acknowledgements are sent from the
BCM2035 to the host. The host uses these returned characters as
indications to transition from one stage to the next. Figure 20 illustrates the downloading protocol between the
host and the BT device for ASCII Intel hex formats.
Figure 20: Host and Bluetooth Device Handshaking: Negotiate Baud Rate and Download Mini-Driver
Over UPRX
Figure 21: Host and Bluetooth Device Handshaking: Negotiate Baud Rate and Download Mini-Driver
Over UART
UPRX High
Host
Host Controller
0x55 (over UPRX)
Negotiation
character 0x55
should not be
sent earlier then
100us
Host Controller's
UPRX should be
TRUE within
100us of Reset
"41"
(at negotiated baud rate
over Host controller's
UPTX)
UPRX HIGH
Host
Host Controller
0x55 (UART
RX)
Negotiation
character 0x55
should not be
sent earlier then
100us
Host Controller's
UPRX and UART-
CTS should be
TRUE within
100us of Reset
"41"
(at negotiated
baud-rate over UART
TX)
CTS