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authorDavid Brownell <dbrownell@users.sourceforge.net>2010-03-19 10:31:44 -0700
committerDavid Brownell <dbrownell@users.sourceforge.net>2010-03-19 10:31:44 -0700
commit3b310dbac5ae1db7fb768aa0789bbe101137c7e1 (patch)
tree97d80ae4a21fbff5cb140bb0dea26c3997cbe1b9 /src
parent7373d1c342ff0ef5c0663fcee2f688eb5eb4ef65 (diff)
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FT2232 comment tweaks
Note that the FT4232 chips have four channels not two, and Elaborate on uses of the additional channels. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Diffstat (limited to 'src')
-rw-r--r--src/jtag/drivers/ft2232.c24
1 files changed, 18 insertions, 6 deletions
diff --git a/src/jtag/drivers/ft2232.c b/src/jtag/drivers/ft2232.c
index b45e8a4d..8e835c59 100644
--- a/src/jtag/drivers/ft2232.c
+++ b/src/jtag/drivers/ft2232.c
@@ -32,12 +32,24 @@
* JTAG adapters based on the FT2232 full and high speed USB parts are
* popular low cost JTAG debug solutions. Many FT2232 based JTAG adapters
* are discrete, but development boards may integrate them as alternatives
- * to more capable (and expensive) third party JTAG pods. Since JTAG uses
- * only one of the two ports on these devices, on integrated boards the
- * second port often serves as a USB-to-serial adapter for the target's
- * console UART even when the JTAG port is not in use. (Systems which
- * support ARM's SWD in addition to JTAG, or instead of it, may use that
- * second port for reading SWV trace data.)
+ * to more capable (and expensive) third party JTAG pods.
+ *
+ * JTAG uses only one of the two communications channels ("MPSSE engines")
+ * on these devices. Adapters based on FT4232 parts have four ports/channels
+ * (A/B/C/D), instead of just two (A/B).
+ *
+ * Especially on development boards integrating one of these chips (as
+ * opposed to discrete pods/dongles), the additional channels can be used
+ * for a variety of purposes, but OpenOCD only uses one channel at a time.
+ *
+ * - As a USB-to-serial adapter for the target's console UART ...
+ * which may be able to support ROM boot loaders that load initial
+ * firmware images to flash (or SRAM).
+ *
+ * - On systems which support ARM's SWD in addition to JTAG, or instead
+ * of it, that second port can be used for reading SWV/SWO trace data.
+ *
+ * - Additional JTAG links, e.g. to a CPLD or * FPGA.
*
* FT2232 based JTAG adapters are "dumb" not "smart", because most JTAG
* request/response interactions involve round trips over the USB link.